Chullin 108

On today’s daf, a new mishnah continues our discussion of netinat ta’am (transferring flavor), this time with a specific focus on meat and milk:

In the case of a drop of milk that fell on a piece of meat, if the drop contains enough milk to impart flavor to that piece of meat, the meat is forbidden. If one stirred the contents of the pot, and the drop contains enough milk to impart flavor to the contents of that entire pot, the contents of the entire pot are forbidden.

Both statements in the mishnah reflect an idea we have already seen in other contexts — that food is rendered unkosher when forbidden flavor has been imparted to it. The Gemara opens its discussion of this mishnah with a declarative statement:

Abaye said: The principle that merely flavor without substance is forbidden applies by Torah law.

The Torah makes no explicit mention of forbidden flavor, so one might have assumed this prohibition was a rabbinic innovation. But Abaye insists that forbidden flavor, even in the absence of a visible morsel of forbidden food, is prohibited on a Torah level. Abaye then lays out his logic:

As, if it enters your mind that flavor is only forbidden by rabbinic law, one can claim: What is the reason that we do not learn that it applies by Torah law from the analogous case of meat cooked in milk? It must be because the prohibition of meat cooked in milk is a novelty. But if the prohibition is a novelty, then even if there is not enough milk to impart flavor, the meat and milk should also be prohibited!

Everyone agrees that the infused flavor of meat in milk, or vice versa, constitutes a Torah-level prohibition. This flavor transfer is the classic expression of the prohibition: based on the thrice-repeated biblical verse, the primary violation involves eating meat that has absorbed the taste of milk through the cooking process.

But recall that Abaye is making the case that all unkosher flavors are forbidden by Torah law, not just meat with milk. He does it by presenting and dismissing an argument one might make for forbidden flavors being only rabbinically prohibited in the case of other prohibitions. The logic here would be that meat and milk is different from other kashrut prohibitions. In most cases, the concern is mixing a permitted substance with a forbidden one, like pork and beans. But in the case of meat and milk, both substances are permitted, and it’s only in combining that they create a forbidden substance. Therefore, I might have argued that due to its uniqueness, the milk and meat flavor prohibition found in the Torah can’t be assumed to extend to other forbidden mixtures.

This sounds reasonable, but it is in fact a straw-man argument that Abaye has presented purely for the purpose of dismantling it. Here’s how he does it: If it’s true that the meat and milk prohibition is a novelty and its rulings can’t be compared with other prohibitions, why do we even think in terms of flavor? Why not say that even the tiniest bit of milk mixed with meat renders it prohibited? From the fact that we care about this metric of flavor, just as we do with other prohibitions, Abaye argues that milk and meat is not necessarily a novelty, and therefore it can be a paradigm for other prohibitions. Ergo, if flavor alone is forbidden on a Torah level for cases of meat mixed with milk, other cases of forbidden mixtures follow the same rules, and are similarly Torah-level prohibitions.

Rava, Abaye’s frequent disputant, contests his proof:

Rava said to Abaye: The Torah prohibited it in the manner of cooking.

Rashi helps us unpack this terse statement. Rava is arguing that milk and meat may in fact be a novelty, and therefore an unhelpful paradigm for other prohibitions, even though it uses the metric of flavor just like all other cases. The prohibition on eating meat and dairy comes from verses that prohibit even cooking them together. Since cooking is about the transfer and melding of flavors, and the Torah only prohibits meat and milk that have been cooked together, it makes sense that meat is only forbidden if the flavor of milk is detectable, and vice versa. This does not, however, diminish its status as a novelty. 

Notably, this is not Rava disproving the halakhah Abaye is arguing for. The Tosafot point out that this is one of many cases in which the rabbis disagree with each other without necessarily disagreeing about the halakhah itself. Rava isn’t saying that Abaye’s ruling is invalid. In fact, we know from elsewhere that Rava agrees flavor alone is a Torah prohibition in all cases! Rather, he’s challenging Abaye’s attempt to prove this rule by using milk and meat as its source. Though he agrees with the conclusion, Rava thinks the argument itself is shoddy. The rabbis care about final rulings, but they also care about how we arrive at them.

Read all of Chullin 108 on Sefaria.

This piece originally appeared in a My Jewish Learning Daf Yomi email newsletter sent on August 16, 2026. If you are interested in receiving the newsletter, sign up here.