Rabbi Baruch Bodenheim: Morning Kollel: גמרא שבת – פרק הבונה דף קב: (08/28/25)
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Category: Shabbos
Rabbi Baruch Bodenheim: Gemara Shabbos: Third Perek – Wednesday night shiur, Elul 4 -Sugya: Heating food on Shabbos (08/27/25)
Halachic Conclusions:
Conclusion of topic below
Questions:
May one move a pot which is placed on the blech in an area which is not directly over the fire to a part of the blech which is directly over the fire?
Is the entire blech considered a stovetop which is גרוף וקטום or is it considered just סמוך לכירה?
Bring a proof
Learn אורחת שבת ח”א פרק ב סע’ סט & ע with the footnotes
Learn אגרות משה או”ח חלק ד ס’ עד, בישול אות יב
Learn חזון איש או”ח ס’ ל”ז ס”ק י
Learn שמירת שבת כהלכתו פרק א סעיף כה & הערה קכו
And קובץ הלכות שבת ח”ב פרק כו סע’ מ & הערה נה
Focus on next question
The prevalent practice is to use a blech on a stovetop which would serve as קטום. What is the source that a sheet of metal would accomplish the same halachic status as placing ash on the coals?
See שולחן ערוך אורח חיים ס’ רנ”ג סע’ ג and משנה ברורה ס”ק פא
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=51
In many electrical appliances the heating elements are covered by a sheet of metal like a crock pot which the walls of the crock pot covers the coils. Does one need to cover/line the crock pot or is the sheet of metal/ walls considered a blech?
Learn רש”י שבת דף לז. “גבה
Learn מגן אברהם שי”ח ס”ק לא
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=26
See ביאור הלכה שי”ח ס’ א “ליתן עליה
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=45
Learn ששכה”ל פרק א סעיף כט & הערה פב (new print)
Learn קובץ הלכות שבת ח”ב פרק כו סע’ יח & הערה כד
Would aluminum foil which does not reduce the temperature be acceptable to be considered קטום?
Learn קובץ הלכות שבת ח”ב פרק כו סע’ יג & הערה יז-יח
Learn ששכה”ל פרק א הערה סג (new print)
If one leaves the aluminum foil on the electrical appliance from week to week. Is it still considered קטום ?
Learn קובץ הלכות שבת ח”ב פרק כו סע’ יט & הערה כז
A hot plate that does not have ability to change its temperature, does it need to be covered?
Learn ששכה”ל פרק א סעיף ל & הערה פג (new print)
Learn אגרות משה או”ח חלק ד ס’ עד בישול ס”ק לה
Learn קובץ הלכות שבת ח”ב פרק כו סע’ כ & הערה כט
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום רביעי, Elul 4, Daf 41a (08/27/25)
Review גמרא דף מא. “א”ר זירא (two dots top of the Amud) until ר’ זירא הוה קא משתמיט (middle of the Amud)
Learn שולחן ערוך אורח חיים ס’ ג סע’ ד with the משנה ברורה
https://hebrewbooks.org/pdfpager.aspx?req=60386&st=&pgnum=20&hilite=
Why is it like bringing a mabul to the world?
See מהרש”א ח’ אגדות נדה דף יג
https://hebrewbooks.org/pdfpager.aspx?req=40053&st=&pgnum=207
Why if one covers his bris is it like he is denying the bris of Avraham?
See מהרש”א
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=457
When did Rav lean forward? When he enters the river or when he exited?
See רש”ש
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=805
And משנה ברורה ס’ ב ס”ק א
https://hebrewbooks.org/pdfpager.aspx?req=60386&st=&pgnum=18
Learn the גמרא דף מא. “ר’ זירא הוה קא משתמיט (middle of the Amud) until the Mishna
Is it also prohibited to move from Bavel to a different country?
Why is it prohibited to move from Bavel to Eretz Yisrael?
Does it apply from other places in chutz laaretz to Eretz Yisrael?
See גמרא כתובת דף קיא and רש”י “כי אסור לצאת מבבל
The alternate way of explaining the pasuk is that it’s referring to the Keilim of the beis Hamikdash.
See מהרש”א ח’ אגדות כתובת דף קי: “עובר בעשה
See רמב”ם ה’ מלכים פרק ה’ הלכה יב
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שלישי, Elul 3, Daf 41a (08/26/25)
Conclusion – Halacha of Swimming on Shabbos:
(For explanation according to the Rif what the uncertainty of Rebbe Zeira was and how this coincides with conclusion of the difference of the pol of water has high walls or not – see שפת אמת)
How does the Shulchan Aruch conclude?
Learn שולחן ערוך אורח חיים ס’ של”ט סע’ ב and the משנה ברורה
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=376
Learn מגן אברהם ס’ שכ”ו ס”ק ח who cites the minhag is not to immerse in a body of water on Shabbos.
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=181
Learn משנה ברורה ס’ שכ”ו ס”ק כד
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=328
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=329
Learn ערוך השולחן ס’ של”ט סע’ ד
Learn שו”ת תשובות והנהגות חלק א ס’ רכב
https://hebrewbooks.org/pdfpager.aspx?req=20025&st=&pgnum=161
https://hebrewbooks.org/pdfpager.aspx?req=20025&st=&pgnum=162
Continue learning the גמרא דף מא. “א”ר זירא (two dots top of the Amud) until ר’ זירא הוה קא משתמיט (middle of the Amud)
Learn שולחן ערוך אורח חיים ס’ ג סע’ ד with the משנה ברורה
Why is it like bringing a mabul to the world?
See מהרש”א ח’ אגדות נדה דף יג
Continue learning the Gemara until the Mishna
Rabbi Baruch Bodenheim: Gemara Shabbos: Third Perek – Monday night shiur, Elul 2 – Sugya: Heating food on Shabbos (08/25/25)
Halachic Conclusions:
Questions:
May one move a pot which is placed on the blech in an area which is not directly over the fire to a part of the blech which is directly over the fire?
Is the entire blech considered a stovetop which is גרוף וקטום or is it considered just סמוך לכירה?
Bring a proof
Learn אורחת שבת ח”א פרק ב סע’ סט & ע with the footnotes
Learn אגרות משה או”ח חלק ד ס’ עד, בישול אות יב
Learn חזון איש או”ח ס’ ל”ז ס”ק י
Learn שמירת שבת כהלכתו פרק א סעיף כה & הערה קכו
And קובץ הלכות שבת ח”ב פרק כו סע’ מ & הערה נה
The prevalent practice is to use a blech on a stovetop which would serve as קטום. What is the source that a sheet of metal would accomplish the same halachic status as placing ash on the coals?
See שולחן ערוך אורח חיים ס’ רנ”ג סע’ ג and משנה ברורה ס”ק פא
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=51
In many electrical appliances the heating elements are covered by a sheet of metal like a crock pot which the walls of the crock pot covers the coils. Does one need to cover/line the crock pot or is the sheet of metal/ walls considered a blech?
Learn רש”י שבת דף לז. “גבה
Learn מגן אברהם שי”ח ס”ק לא
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=26
See ביאור הלכה שי”ח ס’ א “ליתן עליה
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=45
Learn ששכה”ל פרק א סעיף כט & הערה פב (new print)
Learn קובץ הלכות שבת ח”ב פרק כו סע’ יח & הערה כד
Would aluminum foil which does not reduce the temperature be acceptable to be considered קטום?
Learn קובץ הלכות שבת ח”ב פרק כו סע’ יג & הערה יז-יח
Learn ששכה”ל פרק א הערה סג (new print)
If one leaves the aluminum foil on the electrical appliance from week to week. Is it still considered קטום ?
Learn קובץ הלכות שבת ח”ב פרק כו סע’ יט & הערה כז
A hot plate that does not have ability to change its temperature, does it need to be covered?
Learn ששכה”ל פרק א סעיף ל & הערה פג (new print)
Learn אגרות משה או”ח חלק ד ס’ עד בישול ס”ק לה
Learn קובץ הלכות שבת ח”ב פרק כו סע’ כ & הערה כט
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שני, Rosh Chodesh Elul, Daf 40b -41a (08/25/25)
Conclusion Halacha of Swimming on Shabbos:
Very quickly review the גמרא דף מ: “א”ר זירא (three lines from the bottom of the Amud) until the two dots on top of דף מא.
How does the Shulchan Aruch conclude?
Learn שולחן ערוך אורח חיים ס’ של”ט סע’ ב and the משנה ברורה
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=376
Based on the Shulchan Aruch are there swimming pools that are permissible to swim in?
Learn מגן אברהם ס’ שכ”ו ס”ק ח who cites the minhag is not to immerse in a body of water on Shabbos.
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=181
Learn משנה ברורה ס’ שכ”ו ס”ק כד
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=328
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=329
Learn ערוך השולחן ס’ של”ט סע’ ד
https://hebrewbooks.org/pdfpager.aspx?req=67694&st=&pgnum=327
Learn שו”ת תשובות והנהגות חלק א ס’ רכב
https://hebrewbooks.org/pdfpager.aspx?req=20025&st=&pgnum=161
https://hebrewbooks.org/pdfpager.aspx?req=20025&st=&pgnum=162
Continue learning the גמרא דף מא. “א”ר זירא (two dots top of the Amud) until ר’ זירא הוה קא משתמיט (middle of the Amud)
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום חמישי, Av 27, Daf 40b – 41a (08/21/25)
Swimming on Shabbos:
Learn the גמרא דף מ: “א”ר זירא (three lines from the bottom of the Amud) until the two dots on top of דף מא.
Note the two explanations of Rashi whether having a rim around the pool permits or prohibits swimming.
Learn רי”ף and ר”ן
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=586
Question:
What’s is the difference between Rashi first explanation and the Ran explanation of the words עקר?
Learn רמב”ם פרק כג הלכה ה
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=105
Is the Rambam explaining like Rashi or the Ran?
Learn the מלחמת ה’
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587
How does the Shulchan Aruch conclude?
Learn שולחן ערוך אורח חיים ס’ של”ט סע’ ב and the משנה ברורה
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=376
Based on the Shulchan Aruch are there swimming pools that are permissible to swim in?
Learn מגן אברהם ס’ שכ”ו ס”ק ח who cites the minhag is not to immerse in a body of water on Shabbos.
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=181
Learn משנה ברורה ס’ שכ”ו ס”ק כד
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=328
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=329
Learn שו”ת תשובות והנהגות חלק א ס’ רכב
https://hebrewbooks.org/pdfpager.aspx?req=20025&st=&pgnum=161
https://hebrewbooks.org/pdfpager.aspx?req=20025&st=&pgnum=162
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום רביעי, Av 26, Daf 40b -41a (08/20/25)
Learn the גמרא דף מ: “היכי עביד הכי until “א”ר זירא ” (three lines from the bottom of the Amud)
Why is it prohibited to think about Torah in the bath house?
Why is it permitted to tell someone in the bath house that an action they are doing or about to do is prohibited?
Swimming on Shabbos:
Learn the גמרא דף מ: “א”ר זירא (three lines from the bottom of the Amud) until the two dots on top of דף מא.
Note the two explanations of Rashi whether having a rim around the pool permits or prohibits swimming.
Learn רי”ף and ר”ן
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=586
Question:
What’s is the difference between Rashi first explanation and the Ran explanation of the words עקר?
Learn רמב”ם פרק כג הלכה ה
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=105
Is the Rambam explaining like Rashi or the Ran?
Learn the מלחמת ה’
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587
How does the Shulchan Aruch conclude?
Learn שולחן ערוך אורח חיים ס’ של”ט סע’ ב and the משנה ברורה
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=376
Based on the Shulchan Aruch are there swimming pools that are permissible to swim in?
Learn מגן אברהם ס’ שכ”ו ס”ק ח who cites the minhag is not to immerse in a body of water on Shabbos.
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=181
Learn משנה ברורה ס’ שכ”ו ס”ק כד
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=328
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=329
Learn שו”ת תשובות והנהגות חלק א ס’ רכב
https://hebrewbooks.org/pdfpager.aspx?req=20025&st=&pgnum=161
https://hebrewbooks.org/pdfpager.aspx?req=20025&st=&pgnum=162
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שלישי, Av 25, Daf 40b – 41a (08/19/25)
Very quickly review the גמרא דף מ: “א”ר יצחק בר אבדימי (middle of the wide lines) until “היכי עביד הכי”
Question:
Why is it permitted to place uncooked food in a כלי שני? Why should a כלי שני be different than a כלי ראשון if the temperature of the water is still hot enough to cook?
Learn תוס’ “ושמע מינה
Question on Tosfos:
What is the exact reason why kli sheini can not cook. Is it because the walls cool down the liquid or is it because the walls are not hot?
Would a thermos be considered a kli sheini?
Learn אגרות משה או”ח חלק א end of ס’ צה “וטעם זה
https://hebrewbooks.org/pdfpager.aspx?req=916&st=&pgnum=156
and חזון איש או”ח סוף ס’ לז
https://hebrewbooks.org/pdfpager.aspx?req=14336&st=&pgnum=114
Learn שמירת שבת כהלכתו פרק א סע’ ב אות ג & הערה ט
and קובץ הלכות שבת חלק ב פרק כה סע’ ט & הערה יח
Continue learning the גמרא דף מה: “היכי עביד הכי until “א”ר זירא ” (three lines from the bottom of the Amud)
Why is it prohibited to even think about Torah in the bath house?
Why is it permitted to tell someone in the bath house that an action they are doing or about to do is prohibited?
The next Gemara deals with the topic of swimming on Shabbos
Learn the גמרא דף מ: “א”ר זירא (three lines from the bottom of the Amud) until the two dots on top of דף מא.
Note the two explanations of Rashi whether having a rim around the pool permits or prohibits swimming.
Learn רי”ף and ר”ן
What’s is the difference between Rashi first explanation and the Ran explanation of the words עקר?
Learn רמב”ם פרק כג הלכה ה
Is the Rambam explaining like Rashi or the Ran?
Learn the מלחמת ה’
How does the Shulchan Aruch conclude?
Learn שולחן ערוך אורח חיים ס’ של”ט סע’ ב and the משנה ברורה
Learn מגן אברהם ס’ שכ”ו ס”ק ח who cites the minhag is not to immerse in a body of water on Shabbos.
Rabbi Baruch Bodenheim: Gemara Shabbos: Third Perek – Monday night shiur, Av 25 – Sugya: Heating food on Shabbos (08/18/25)
How can one heat up cold solid food from the refrigerator on Shabbos morning?
Quickly review שולחן ערוך ס’ שי”ח סע’ ז & ח
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=277
Review מגן אברהם ס’ שי”ח ס”ק כו
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=155
Major Questions:
How does the two opinions brought in ס’ שי”ח סע’ ז & ח fit with the ruling of the שולחן ערוך ס’ רנ”ג סע’ ג & ה?
Why does the Shulchan Aruch ס’ רנ”ג סע’ ה permit one to place a cold pot of food on top of a pot on a fire but in סע’ ג only permits חזרה?
Learn מגן אברהם ס’ רנ”ג ס”ק לג
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=27
There is a major dispute between the דגול מרבבה and the פרי מגדים on how to explain the ruling of the שולחן ערוך with major halachic ramifications.
Learn דגול מרבבה on the מגן אברהם
https://hebrewbooks.org/pdfpager.aspx?req=7631&st=&pgnum=32
Learn פרי מגדים אשל אברהם ס”ק לג
https://hebrewbooks.org/pdfpager.aspx?req=41248&st=&pgnum=163
What is the halachic differences between the דגול מרבבה and the פרי מגדים?
Whom do we rule in accordance with?
Learn ביאור הלכה ס’ רנ”ג סע’ ג “ויזהר שלא ישים
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=49
Is there another way to answer the difference in the Shulchan Aruch?
Learn שולחן ערוך הרב ס’ רנ”ג סע’ כו and קונטרס אחרון (on bottom) ס”ק י for a third explanation
https://hebrewbooks.org/pdfpager.aspx?req=25073&st=&pgnum=137
https://hebrewbooks.org/pdfpager.aspx?req=25073&st=&pgnum=138
https://hebrewbooks.org/pdfpager.aspx?req=25073&st=&pgnum=139
In Conclusion:
Many people have the practice of turning a pan upside down and placing cold fully cooked solid food from the refrigerator on top of the upside down pan on Shabbos morning?
Is this permitted according to the פרי מגדים?
Learn שמירת שבת כהלכתו פרק א סעיף מד & הערה קכו
And see קובץ הלכות שבת ח”ב פרק כו סע’ לד & הערה מח
Question:
If one places a pan of food on top of a soup pot which is on the blech. May one move the pan on Shabbos and place it directly on the blech?
Point to consider:
What is the status of a pot of food that is resting on top of another pot which is on the stovetop.
Is it considered on the fire which is גרוף וקטום or is it considered just סמוך לכירה ?
Bring a proof
See מגן אברהם ס’ רנ”ג ס”ק לג
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=27
Learn שמירת שבת כהלכתו פרק א סעיף מד & הערה קכו
And see קובץ הלכות שבת ח”ב פרק כו סע’ מ & הערה נה
Question:
May one move a pot which is placed on the blech in an area which is not directly over the fire to a part of the blech which is directly over the fire?
Point to Consider:
Is the entire blech considered a stovetop which is גרוף וקטום or is it considered just סמוך לכירה ?
Bring a proof
Learn אורחת שבת ח”א פרק ב סע’ סט & ע with the footnotes
Learn אגרות משה או”ח חלק ד ס’ סא ס’ עד בישול ס”ק יב
Learn חזון איש או”ח ס’ ל”ז ס”ק י
Learn שמירת שבת כהלכתו פרק א סעיף כה & הערה קכו
And קובץ הלכות שבת ח”ב פרק כו סע’ מ & הערה נה
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שני, Av 24, Daf 40b (08/18/25)
Very quickly review the גמרא דף מ: “א”ר יצחק בר אבדימי (middle of the wide lines) until “היכי עביד הכי”
Learn the רי”ף who has a different Girsa in the third Halacha.
Learn the ר”ן who explains the difference.
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587
Question:
Is it permitted to place water near a fire to warm up when the fire will go out before the water heats up to יד סולדת?
Learn שולחן ערוך אורח חיים ס’ שי”ח סע’ יד & משנה ברורה ס”ק צ & צא
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=280&hilite=
Learn אגרות משה או”ח חלק א ס’ צג
https://hebrewbooks.org/pdfpager.aspx?req=916&st=&pgnum=152
https://hebrewbooks.org/pdfpager.aspx?req=916
Learn שמירת שבת כהלכתו פרק א הערה ח
Why is the case of a timer that will shut off the electricity before the water can get hot different from heating towels?
Major Question:
Why is it permitted to place uncooked food in a כלי שני? Why should a כלי שני be different than a כלי ראשון if the temperature of the water is still hot enough to cook?
Learn תוס’ “ושמע מינה
Question on Tosfos:
What is the exact reason why kli sheini can not cook. Is it because the walls cool down the liquid or is it because the walls are not hot?
Would a thermos be considered a kli sheini?
Learn אגרות משה או”ח חלק א end of ס’ צה “וטעם זה
https://hebrewbooks.org/pdfpager.aspx?req=916&st=&pgnum=156
and חזון איש או”ח סוף ס’ לז
https://hebrewbooks.org/pdfpager.aspx?req=14336&st=&pgnum=114
Learn שמירת שבת כהלכתו פרק א סע’ ב אות ג & הערה ט
and קובץ הלכות שבת חלק ב פרק כה סע’ ט & הערה יח
Continue learning the גמרא דף מה: “היכי עביד הכי until “א”ר זירא ” (three lines from the bottom of the Amud)
Why is it prohibited to even think about Torah in the bath house?
Why is it permitted to tell someone in the bath house that an action they are doing or about to do is prohibited?
The next Gemara deals with the topic of swimming on Shabbos
Learn the גמרא דף מ: “א”ר זירא (three lines from the bottom of the Amud) until the two dots on top of דף מא
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום חמישי, Av 20, Daf 40b (08/14/25)
Quickly review the גמרא דף מ: “א”ר יצחק בר אבדימי (middle of the wide lines) until “היכי עביד הכי”
Do we conclude lhalacha in accordance with all three?
Learn the רי”ף who has a different Girsa in the third Halacha.
Learn the ר”ן who explains the difference.
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587
Questions:
Why is the bath considered a כלי ראשון?
Learn רש”י “בכלי שני
Learn רש”י “וש”מ הפשרו
What is Rashi adding?
Is it permitted to place water near a fire to warm up when the fire will go out before the water heats up to יד סולדת?
Learn שולחן ערוך אורח חיים ס’ שי”ח סע’ יד & משנה ברורה ס”ק צ
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=280&hilite=
Learn אגרות משה או”ח חלק את ס’ צג
https://hebrewbooks.org/pdfpager.aspx?req=916&st=&pgnum=152
https://hebrewbooks.org/pdfpager.aspx?req=916
Learn שמירת שבת כהלכתו פרק א הערה ח
See משנה ברורה ס”ק צא
Why is the case of a timer that will shut off the electricity before the water can get hot different than heating towels?
Major Question:
Why is it permitted to place uncooked food in a כלי שני? Why should a כלי שני be different than a כלי ראשון if the temperature of the water is still hot enough to cook?
Learn תוס’ “ושמע מינה
What is the exact reason why kli sheini can not cook. Is it because the walls cool down the liquid or is because the walls are not hot?
Would a thermos be considered a kli sheini?
Continue learning the גמרא דף מ. “היכי עביד הכי until “א”ר זירא ” (three lines from the bottom of the Amud)
Next Gemara deals with the topic of swimming on Shabbos
Learn the גמרא דף מ: “א”ר זירא (three lines from the bottom of the Amud) until the two dots on top of דף מא
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום רביעי, Av 19, Daf 40b (08/13/25)
Learn the גמרא דף מ: “א”ר יצחק בר אבדימי (middle of the wide lines) until “היכי עביד הכי”
Do we conclude lhalacha in accordance with all three?
Learn the רי”ף who has a different Girsa in the third Halacha.
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587
Learn the ר”ן who explains the difference.
Questions:
Why is the bath considered a כלי ראשון?
Learn רש”י “בכלי שני
Learn רש”י “וש”מ הפשרו
What is Rashi adding?
Is it permitted to place water near a fire to warm up when the fire will go out before the water heats up to יד סולדת?
Learn שולחן ערוך אורח חיים ס’ שי”ח סע’ יד & משנה ברורה ס”ק צ
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=280&hilite=
Learn אגרות משה או”ח חלק את ס’ צג
https://hebrewbooks.org/pdfpager.aspx?req=916&st=&pgnum=152
https://hebrewbooks.org/pdfpager.aspx?req=916&st=&pgnum=153
Learn שמירת שבת כהלכתו פרק א הערה ח
See משנה ברורה ס”ק צא
Why is the case of a timer that will shut off the electricity before the water can get hot different than heating towels?
Major Question:
Why is it permitted to place uncooked food in a כלי שני? Why should a כלי שני be different than a כלי ראשון if the temperature of the water is still hot enough to cook?
Learn תוס’ “ושמע מינה
Continue learning the גמרא דף מ. “היכי עביד הכי until “א”ר זירא ” (three lines from the bottom of the Amud)
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שלישי, Av 18, Daf 40b (08/12/25)
Halachic Conclusion
Cooking on Shabbos Raw Fruits, Vegetables, Water & Oil
Quickly review the גמרא דף מ”: “א”ר יהודה אמר שמואל ( middle of the wide lines) until א”ר יצחק בר אבדימי
In Conclusion:
Is the an איסור דאורייתא to cook on Shabbos fruits or vegetables which are edible raw but will be improved by cooking it?
Write out the machlokes between the Mishna Berura and Rebbe Akiva Eiger in regards to this question and how to explain the words of the Rambam
See רמב”ם ה’ שבת פרק ט הלכה ג “המבשל על האור and מגיד משנה
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=38
Learn שו”ע ס’ רנ”ד סע’ ד
See שער הציון ס’ שי”ח אות קיד
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=280&hilite=
See מ”א ס’ רנ”ד ס”ק יד
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=29
See ה’ רע”א שו”ע ס’ רנ”ד ס”ק י”ד
Note the two different ways to explain the Rambam
See the אגלי טל אופה אות י who summarizes the two opinions
https://hebrewbooks.org/pdfpager.aspx?req=14401&st=&pgnum=247
Learn רמב”ם ה’ שבת פרק ט הלכה ו who defines the Melacha of Bishul as softening something hard or hardening something soft through the application of heat.
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=40
According to the Rambam why is heating water a violation of cooking?
See the אגלי טל אופה אות י ס”ק יט אות יב & י”ג
https://hebrewbooks.org/pdfpager.aspx?req=14401&st=&pgnum=248
Clarify the argument between the שער הציון and the אגלי טל explanation for Rebbe Akiva Eiger why water which is drinkable at room temperature is a violation of cooking.
Continue learning the גמרא דף מ: “א”ר יצחק בר אבדימי (middle of the wide lines) until “היכי עביד הכי”
Learn the רי”ף who has a different Girsa in the third Halacha.
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587
Learn the ר”ן who explains the difference.
Learn תוס’ “ושמע מינה
Rabbi Baruch Bodenheim: Gemara Shabbos: Third Perek – Monday night shiur, Av 18 – Sugya: Heating food on Shabbos (08/11/25)
How can one heat up cold solid food from the refrigerator on Shabbos morning?
Review שולחן ערוך ס’ שי”ח סע’ ז & ח which brings two opinions whether one may place a fully cooked food on top of a pot which is on the fire.
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=277
What is the difference between סע’ ז & סע’ ח
Is the conclusion of the Shulchan Aruch that it is permitted just for סע’ ח or also for סע’ ז ?
Learn שולחן ערוך ס’ רנ”ג סע’ ג
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=51
Why does the Shulchan Aruch only permit חזרה to an empty pot and not to place it on the empty pot like in סע’ ה?
Learn מגן אברהם ס”ק לא
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=26
May one take an empty pot and turn it upside down and place the cold food on top of it?
See שמירת שבת כהלכתו פרק א הלכה ?
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שני, Av 17, Daf 40b Cooking fruit & vegetable & heating water on Shabbos (08/11/25)
Halachic Conclusion:
Why is heating water a violation of cooking?
Is it permitted to cook fruits or vegetables which are edible raw on Shabbos?
Learn רמב”ם ה’ שבת פרק ט הלכה ג “המבשל על האור
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=38
and מגיד משנה
Major Question:
Why is heating water a violation of cooking according to the Rambam as water is edible raw?
Learn שו”ע ס’ רנ”ד סע’ ד
How could the Shulchan Aruch rule that one who cooks fruit or vegetables which are edible raw is violating the melacha of cooking on Shabbos when the Rambam clearly rules one is not in violation?
Learn שער הציון ס’ שי”ח אות קיד
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=280&hilite=
See מ”א ס’ רנ”ד ס”ק יד
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=29
Learn ה’ רע”א שו”ע ס’ רנ”ד ס”ק י”ד
Note the two different ways to explain the Rambam
Learn אגלי טל אופה אות י & ס”ק יט אות יב – י”ג
https://hebrewbooks.org/pdfpager.aspx?req=14401&st=&pgnum=248
Who gives an explanation why heating water is a violation of cooking.
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שלישי, Av 11, Daf 40b (08/05/25)
Very quickly review the גמרא דף מ: “ת”ר מביא אדם until איבעיא להו”
Learn the גמרא דף מ: “איבעיא להו
until א”א יצחק בר אבדימי (middle of the wide lines)
There are three opinions in regards to heating oil on Shabbos.
Major Questions:
How is it possible to say that one who cooks oil does not violate cooking on Shabbos?
Why would warming oil to lukewarm temperature be considered cooking?
According to רשב”ג that there is cooking by oil and even warming up the oil is considered cooking why is it permitted to lather ones hands with oil and hold it near a fire?
Learn רמב”ם ה’ שבת פרק ט הלכה ג “המבשל על האור
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=38
and מגיד משנה
Learn פני יהושע דף מ: רש”י “ואתי ר”ש למימר
https://hebrewbooks.org/pdfpager.aspx?req=14633&st=&pgnum=138
Learn ראש יוסף דף מ: “והנה ראיתי לספר חמד משה until עוד אבאר
https://hebrewbooks.org/pdfpager.aspx?req=40668&st=&pgnum=161
Is it prohibited to cook fruits or vegetables which are edible raw on Shabbos?
See רמב”ם ה’ שבת פרק ט הלכה ג “המבשל על האור
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=38
and מגיד משנה
Learn שו”ע ס’ רנ”ד סע’ ד
How could the Shulchan Aruch rule that one who cooks fruit or vegetables which are edible raw is violating the melacha of cooking on Shabbos when the Rambam clearly rules one is not in violation?
Learn שער הציון ס’ שי”ח אות קיד
See מ”א ס’ רנ”ד ס”ק יד
Learn ה’ רע”א שו”ע ס’ רנ”ד ס”ק י”ד
Learn אגלי טל אופה אות י & ס”ק יט אות יב – י”ג
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שלישי, Av 4, Daf 40b (07/29/25)
Review גמרא שבת דף מ: “ת”ר מתחמם אדם (fourth line of the Amud) until ת”ר מביא אדם
Question:
Why is it prohibited to warm oneself next to a fire after taking a cold shower on Shabbos?
Learn תוס’ “מפני
Learn ר”ן “ת”ר מתחמם
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587
Learn ח’ רמב”ן “ובלבד who gives a different reason
https://hebrewbooks.org/pdfpager.aspx?req=14135&st=&pgnum=36&hilite=
How do we conclude lhalacha?
Learn שולחן ערוך אורח חיים ס’ שכ”ו סע’ ד-ה and משנה ברורה
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=327
Learn רמב”ם ה’ שבת פרק כב הלכה ג
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=99
Bring a proof which reason the Rambam is in accordance with
What’s a נפקא מיניה between the reasons?
Learn שער הציון אות ח
Continue learning the גמרא דף מ: “ת”ר מביא אדם until איבעיא להו”
Learn Rashi
According to Rashi what are the parameters in which one is permitted to place a bottle of water near a fire to warm up?
Learn ר”ן who gives a different explanation than Rashi
Rabbi Baruch Bodenheim: Gemara Shabbos: Third Perek – Av 4 – Sugya: Chazara Halachic Conclusions (07/28/25)
Halachic Conclusions of הלכות חזרה:
Questions:
A pot that was left on a hot spot on the blech and then moved over to a spot which is not יד סולדת with intent to return to the hotter area but person let go of the pot, may it be returned to the hot spot on the blech?
See אגרות משה או”ח חלק ד ס’ סא
https://hebrewbooks.org/pdfpager.aspx?req=920&st=&pgnum=96&hilite=
And שמירת שבת כהלכתו פרק א הערה קכה
And קובץ הלכות ה’ שבת חלק ב פרק כו סע’ מח והערה אות סז
Is there a permissible way to take cooked food from refrigerator and reheat it on Shabbos?
Learn בית יוסף ס’ רנ”ג סע’ ג & ה (it’s at the end of ס’ רנ”ג in the טור / בית יוסף )
https://hebrewbooks.org/pdfpager.aspx?req=14265&st=&pgnum=428
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שני, Av 3, Daf 40b (07/28/25)
Learn גמרא שבת דף מ: “ת”ר מתחמם אדם (fourth line of the Amud) until ת”ר מביא אדם
Question:
Why is it prohibited to warm oneself next to a fire after taking a cold shower on Shabbos?
Learn תוס’ “מפני
Learn ר”ן “ת”ר מתחמם
https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587
Learn ח’ רמב”ן “ובלבד who gives a different reason
https://hebrewbooks.org/pdfpager.aspx?req=14135&st=&pgnum=36&hilite=
What’s a נפקא מיניה between the reasons?
Learn רמב”ם ה’ שבת פרק כב הלכה ג
How does the Rambam explain reason?
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=99
How do we conclude lhalacha?
Learn שולחן ערוך אורח חיים ס’ שכ”ו סע’ ד-ה and משנה ברורה
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=327
For explanation in the Rambam – see שער הציון אות ח
Continue learning the גמרא דף מ: “ת”ר מביא אדם until איבעיא להו”
Learn Rashi
Learn ר”ן who gives a different explanation than Rashi
Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום חמישי, Tamuz 28, Daf 39b-40b – Bathing on Yom Tov (07/24/25)
Bathing on Yom Tov
Can one heat water to take a luke warm shower?
Learn שער הציון ס’ תקי”א אות כה
When one opens up the hot water faucet on Yom Tov, is the water which comes out considered heated before Yom Tov?
Learn שמירת שבת כהלכתו פרק יד הערה יב
May one open the hot water tap to take a lukewarm shower which allows new cold water to enter the hot water tank – effectively heating it up. Is it considered heating up the water to bathe ones entire body or heating for permitted use as the water in the tank is not designated for specific use and will be used to wash dishes or wash one’s hands?
See Celebrating Yom tov from Rabbi Hershel Welcher Chapter 3, footnote 46 below
Does the minhag not to bathe in cold water on Shabbos also apply to Yom tov?
If yes does it extend to showering?
What’s the halachic conclusion regarding bathing on Yom tov?
Is it ever permitted and if so in which way?
According to the Mechaber?
According to the Rema?
Learn שולחן ערוך אורח חיים ס’ תקי”א סע’ ב with the משנה ברורה and ביאור הלכה
https://hebrewbooks.org/pdfpager.aspx?req=60390&st=&pgnum=259
https://hebrewbooks.org/pdfpager.aspx?req=60390&st=&pgnum=260
