Today’s daf spoke to me as a teacher. Let’s see why:
Rabbi Yehuda says that Rabbi Akiva would teach this halakhah: Fat slaughtered in the villages requires intention, but the fat does not require (one to come into contact with a liquid in order to be) rendered susceptible to impurity, as it was already rendered susceptible by the (blood of) slaughter.
While Jews are prohibited from eating the fat of domestic animals (Leviticus 7:23–25), they may sell it to non-Jews for their own consumption. However, Rashi explains, in some villages non-Jews also abstained from animal fat — either because meat was so abundant that they didn’t have to eat this part of the animal, or because they were so poor that they couldn’t afford such a delicacy. Rabbi Akiva thinks that in these villages animal fat isn’t considered food unless someone intends to make it food at the moment of slaughter. If it is not food, this changes the equation on its susceptibility to impurity.
Rabbi Akiva, in this teaching, holds that even if fat (which Jews may not eat and non-Jews refrain from eating) is no longer in the category of food, it is still susceptible to impurity because it came into contact with blood during the process of animal slaughter. Rabbi Yehuda, who reports this view, then responds:
“You taught us, our teacher, that in a case of endives that one picked and rinsed for an animal, and one later reconsidered and decided to designate them for humans, they need to come into contact with liquid to be rendered susceptible to impurity.”
Rabbi Akiva then retracted and taught the halakhah in accordance with Rabbi Yehuda.
Rabbi Yehuda gently notes an inconsistency between Rabbi Akiva’s position on animal fat and his position on endives. Endives are food if they are picked for human consumption, but they are not food if they are picked for animal feed. An endive can become food if the intention changes — if it goes from animal feed to salad.
In this particular ruling, Rabbi Akiva holds that an item must come into contact with liquid after it has been designated as human food in order to be susceptible to impurity. So why, asks Rabbi Yehuda, when it comes to animal fat, would Rabbi Akiva think that coming into contact with liquid before its designation as human food renders it susceptible?
Rabbi Akiva understands Rabbi Yehuda’s critique, and it changes his mind. He then agrees with Rabbi Yehuda that the fat must come into contact with liquid after it is designated a food in order to become susceptible to impurity.
This exchange is how the best teaching moments work. Ideally, we learn as much from our students as they do from us. And hopefully, when challenged, we have the humility to learn and grow, even if it means publicly changing our minds about our prior positions. But the talmudic discussion doesn’t end there.
One sage (Rabbi Meir) holds in accordance with what Rabbi Akiva taught originally, and one sage (Rabbi Shimon) holds in accordance with what he taught after his retraction.
Even as we learn and grow as teachers, that which we previously taught lives on in the minds of our students. Our prior opinions, even if wrong (and sometimes, especially if wrong) continue to shape those who heard them. Being a teacher comes with profound responsibility – to be humble and admit when we get it wrong, to change as we learn new things, but equally, to do the work to be as right as possible the first time we teach something. Because we never know how the things we say and do affect those who learn from us.
Read all of Chullin 128 on Sefaria.
This piece originally appeared in a My Jewish Learning Daf Yomi email newsletter sent on September 5, 2026. If you are interested in receiving the newsletter, sign up here.
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