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.