Rabbi Baruch Bodenheim: Gemara Shabbos: Perek Kirah, יום שלישי, Teves 3 – Cooking After Cooking (12/23/25)

Cooking After Cooking 

We learnt the…גמרא דף לט. “כל שבא (until the two dots) which clearly states that once an item was cooked it may be reheated inside a Kli Rishon.

https://hebrewbooks.org/shas.aspx?mesechta=2&daf=39&format=pdf

Learn רשב”א דף לט. “חלח which says this Mishna is teaching us the rule אין בישול אחר בישול 

Does this apply to liquid that was cooked and cooled down? 

Review רש'”י דף לד. “גזירה שמא (three lines from bottom of the page) which states there is a violation of cooking by reheating item that was cooked and cooled down. 

https://hebrewbooks.org/shas.aspx?mesechta=2&daf=34&format=pdf

The רא”ש פרק ג ס’ י “ולמאי דפ’ דלא שייך בישול (last few lines) and ס’ יא gave a different explanation in the Gemara reason as to why one may not insulate an item on Shabbos as the Rabanan were concerned one might stoke the coals

https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=354

Learn ר”ן פרק ג. דף מג. “תנו רבנו מביא אדם קיתון של מים starting from the words “מיהו הני מילי בדבר שלא נתבשלה ” (towards the end of the paragraph)

https://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=587

Another point to consider 

If an item was partially cooked is it prohibited to cook it further? 

Does it matter if the item was cooked כמאכל בן דרוסאי? 

Learn טור ס’ שי”ח סע’ ד & טו

https://hebrewbooks.org/pdfpager.aspx?req=14268&st=&pgnum=40

https://hebrewbooks.org/pdfpager.aspx?req=14268&st=&pgnum=41

https://hebrewbooks.org/pdfpager.aspx?req=14268&st=&pgnum=47

Learn בית יוסף who discusses the machlokes between Rashi and the Ran whether reheating cooked liquids that have cooled down is a violation of cooking on Shabbos.

Learn ב”ח for his explanation 

Learn שולחן ערוך אורח חיים ס’ שי”ח סע’ ד & טו

What is the ruling of the Mechaber?

What is the ruling of the Rema? 

https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=273

https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=280

https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=281