Chullin 103

We’ve all been there: You look up from washing your hands at the bathroom sink, glance in the mirror and notice that there’s spinach stuck between your teeth. You probably wondered why no one told you it was there, but have you ever wondered whether such a small amount of food is considered legally significant for discussions of kashrut?

The Talmud has. 

Rabbi Shimon ben Lakish says: The olive-bulk of which the sages spoke is measured by the food one actually swallows, aside from the food that remains stuck between the teeth. And Rabbi Yohanan says that it includes even the food that remains stuck between the teeth.

Eating forbidden food incurs liability when consumed in quantities of an olive-bulk or more. (An olive-bulk is about a mouthful — what later authorities estimate to be the size of half an egg.) Here, Rabbi Shimon ben Lakish, also known as Reish Lakish, argues that if you consume a mouthful of forbidden food, you are liable only for the amount that goes down your throat. What is stuck between your teeth is not part of the calculation. But Rabbi Yohanan holds someone liable for the quantity of both that which is swallowed and that which remains in the mouth.

This may seem like a silly debate. Does anyone ever have such a meaningful amount of food stuck between their teeth that it could actually make them liable when otherwise they wouldn’t be?

The debate is really about a more interesting question: At what point in the consumption process is one considered to have actually eaten unkosher food? When it is in one’s mouth? Or when it passes to one’s stomach?

Rav Pappa says: With regard to food that remains stuck between the teeth, everyone agrees that it is not included in measuring an olive-bulk that would render one liable to receive lashes. When they disagree it is with regard to food that remains on the palate. One sage, Rabbi Yohanan, holds that since his throat derives pleasure from an olive-bulk, he is liable. And one sage, Reish Lakish, holds that in order to be liable, we require an act of eating that enters his stomach.

My Uncle Lou, z”l, distinguished between what he called “mouth hungry” and “stomach hungry.” There is a similar distinction under discussion here: taste (“his throat derives pleasure”) versus satiation (“it enters his stomach”). 

Rabbi Asi suggests another example that gets a little gross: 

Rabbi Asi says that Rabbi Yohanan says: If one ate half an olive-bulk of a forbidden food and vomited it, and then ate another half an olive-bulk, he is liable. What is the reason? It is because his throat derives pleasure from an olive-bulk.

In this icky contrived example, the person never had a full olive-bulk of forbidden food in his stomach, but a full olive-bulk did pass through his throat. According to Rabbi Asi (quoting Rabbi Yohanan), he is liable — because he got the pleasure of tasting a full olive-bulk, even though he never had that much in his stomach.

It gets grosser. After raising a concern from Rabbi Elazar about whether a person who vomits the food (eww) and then consumes what came up (double eww) is twice liable (they are), the Gemara affirms that liability for consuming forbidden food depends on the experience of tasting it, not on putting (or keeping) it in one’s belly. The later codes agree; Maimonides (Mishneh Torah, Forbidden Foods 14:3) summarizes: “The liability is for the benefit one’s palate receives from a forbidden substance.”

That’s a pretty clear answer and could have been the end of it. But the Gemara records a final anecdote about Rabbi Asi to conclude the chapter. 

Rabbi Asi forgot the statement that he had learned from Rabbi Yohanan, and Rabbi Elazar came to remind him … that since his throat derives pleasure from a full olive-bulk, he is liable. Rabbi Asi was silent and did not say anything. Rabbi Elazar said to him: Wonder of the generation, did you not say this case many times before Rabbi Yohanan, and he said to you: This person is liable because his throat derives pleasure from a full olive-bulk?

Rabbi Elazar not only reminds Rabbi Asi of the teaching, but he also lauds him as the “wonder of the generation” — praising his rabbi’s scholarship and influence, even in the face of his current confusion and forgetfulness. Embedded in a discussion as mundane as food caught in the teeth (and possibly regurgitated), the Gemara takes the time to preserve a lesson about honoring one’s teacher. 

Read all of Chullin 103 on Sefaria.

This piece originally appeared in a My Jewish Learning Daf Yomi email newsletter sent on August 11, 2026. If you are interested in receiving the newsletter, sign up here.