Shabbat 42B

אבל נותן הוא לתוך הקערה או לתוך התמחוי. רבי יהודה אומר: לכל הוא נותן, חוץ מדבר שיש בו חומץ וציר.

However, one may place the spices into a bowl or into a tureen [tamḥui], which is a large bowl into which people pour the contents a stew pot or a pot. Bowls and tureens are both secondary vessels and food placed into them does not get cooked. R' Yehuda says: One may place spices into anything on Shabbat except for a vessel that has in it something containing vinegar or brine of salted fish.

גמ׳ איבעיא להו: רבי יהודה ארישא קאי ⁠— ולקולא, או דילמא אסיפא קאי ⁠— ולחומרא.

Talmud: A dilemma was raised before the rabbis: Is R' Yehuda referring to the first clause of the Mishnah and being lenient? According to that possibility, the Mishnah prohibits placing spices into any boiling pot and R' Yehuda holds that this only applies if there is fish brine or vinegar inside the pot. Or perhaps he is referring to the latter clause of the Mishnah and is being stringent? The Rabbis said that one is permitted to place spices into a bowl or a tureen, and R' Yehuda came to add a stringency and say that if the bowl or tureen contains vinegar or brine, it is prohibited to place spices into it.

תא שמע, דתניא רבי יהודה אומר: לכל אילפסין הוא נותן, לכל הקדירות רותחות הוא נותן, חוץ מדבר שיש בו חומץ וציר.

Come and hear a resolution to this dilemma from that which was taught explicitly in a baraita that R' Yehuda says: Into all stew pots one may place spices on Shabbat; into all pots, even those that are boiling, one may place spices, except for one that contains vinegar or brine. The baraita clearly indicates that R' Yehuda disputes the first clause of the Mishnah and is being lenient.