Chullin, Chapter 8, Mishnah 3. Until now the chapter has dealt largely with meat and milk that come into contact, and with the rabbinic safeguards built around them. Our mishnah moves to a case where milk and meat were genuinely cooked together, and asks when the mixture can still be nullified and eaten and when the problem spreads until the entire pot is lost. It then turns to two organs that require preparation before cooking, the udder and the heart, and closes with a reminder about fowl and cheese at the table.
A drop of milk on a slice of meat
"Tipat chalav shenafla al hachaticha": a drop of milk falls onto a slice of meat. The mishnah is describing a very specific arrangement. This slice is not submerged in the boiling liquid; it is resting on top of another slice that is sitting in the rotev. The drop therefore lands on this one slice alone and is not immediately dispersed through the pot.
The ruling continues: "im yesh ba benoten ta'am", if there is in the milk sufficient volume to give taste, "be'ota chaticha, assur", within that slice, then the slice is prohibited. In other words, if the milk is significant relative to the piece it fell upon, that piece is off limits. The measure, as always, is sixty. Where the slice does not hold sixty times the volume of the milk, say the proportions come out to fifty nine parts meat against one part milk, nothing is nullified, and we treat the dairy flavor as genuinely present inside that meat.
How the problem spreads
From this point the prohibition travels outward to everything else in the pot. Why? Because the piece that absorbed the milk can no longer be regarded as meat with a bit of milk lodged in it. The principle is stated as "chaticha atzma na'aseit neveila": the slice in its own right has been transformed into a prohibited substance, a single solid unit of basar bechalav.
Once that has happened, the entire slice is now a source of prohibited flavor. It is lying on top of a second slice that sits in the soup, so it transmits its taste into that second slice, which in turn becomes forbidden, and from there the prohibition reaches the rest of the food in the pot.
This is the striking point. Even though the pot as a whole contains sixty times the volume of that single drop of milk, and probably far more, everything becomes forbidden. The reason is that we no longer measure against the drop. Once the first slice was rendered forbidden in its entirety, we now need sixty times the volume of that whole slice in order to nullify it. What began as one drop snowballs, piece by piece, until the entire pot is lost.
If he stirred the pot
"Ni'er et hakedera." If he shook or stirred the pot immediately when the drop fell, the milk never had the opportunity to settle into that one exposed slice and render it forbidden on its own. Instead it was distributed throughout the pot and is regarded as belonging to all of the food together.
The mishnah then applies the same wording to the whole vessel: "im yesh ba benoten ta'am", "be'ota kedera, assur". The only question left is how the drop stands in relation to the contents of the pot as a whole. Should the milk amount to less than one part in sixty of the total, it contributes no taste and every bit of the food stays permitted. The pot becomes prohibited only where the combined food does not reach sixty times the volume of the milk.
The udder
"Hakechal, kor'o umotzi et chalavo." The udder of an animal that has undergone shechitah must be torn open so that its milk is drawn out of it. In practical terms, he slices it along its length and then across its width so that it lies open, and presses it hard against a wall so that the milk is forced out. Having done this, he is permitted to put the udder into the pot alongside other meat and eat the whole thing, even if some residue of milk is still lodged within it.
De'oraita there is no difficulty here whatsoever: milk left in the udder after shechitah may be cooked with meat and consumed. The Torah writes "lo tevashel gedi bachalev imo," you shall not cook a kid in the milk of its mother, and the wording teaches that the issur extends only to milk belonging to a beast that could yet function as a mother, meaning an animal that is alive. Milk sitting inside a carcass, an animal that will never mother anything again, does not fall within the verse.
All the same, the chachamim legislated against consuming udder milk in the company of meat, lest people grow casual and come to do the very same thing with regular milk. Hence the obligation to make a genuine effort: rip the udder open and squeeze until the milk is expelled. Whatever trace unavoidably stays behind after such an effort may go into the pot with meat and be eaten without hesitation, since he has already done everything in his power to draw the milk out.
If he did not tear it open
"Lo kera'o, eino over alav." If he did not open the udder and remove its milk but simply cooked the udder by itself, he has not transgressed anything, not a Torah prohibition and not even a rabbinic one. The decree of the chachamim addressed only cooking the udder together with other meat. When the udder is cooked with its own meat, there is no problem.
The phrase the mishnah selects, "eino over alav," no transgression has taken place, carries the ring of something tolerated after the fact, as though the preferred course would have been otherwise. Even so, the halachah stands that the udder cooked in this manner may be eaten just as it is, and we harbor no suspicion that such leniency will draw him into eating ordinary meat together with milk.
The heart
"Halev, kor'o umotzi et damo." The heart, too, needs to be split open so that the blood held inside it is taken out before it is eaten, since what is trapped there is plain dam, which the Torah forbids. With the blood drained, the heart may then be handled like any ordinary cut of meat.
"Lo kera'o, eino over alav." Should he fail to split the heart and draw off its blood, no transgression is attributed to him. This requires precision: what it conveys is that karet is not incurred. Consuming the blood inside the heart is unquestionably prohibited, and the mishnah's sole point is that the severe penalty does not attach to it.
Fowl and cheese on the table
The closing clause reads "hama'aleh et ha'of," one who serves poultry, chicken for instance, setting it "im hagevina al hashulchan," beside cheese on the table, and the ruling is "eino over be'lo ta'aseh," he stands in no danger of breaching a negative commandment of the Torah. The opening mishnah of our perek already established that such a table setting is not permitted. Nevertheless, no biblical issur could ever emerge from it, since cooking or eating bird meat with milk is nowhere forbidden by the Torah itself, as the coming mishnah will state. The point being made is that although the arrangement is barred, a de'oraita violation is simply not on the horizon.