Chulin 8:3-4

Chulin 8:3

If a drop of milk fell onto a piece of meat (in a cooking pot) and it was of sufficient volume to impart flavor, then the meat is prohibited. If a person stirred the pot into which the milk fell and it was of sufficient volume to impart flavor in the pot, then the entire dish being cooked is prohibited. The udder of a slaughtered animal must be cut open and the milk removed, though if one didn’t cut it open, he doesn’t violate the prohibition against cooking meat and milk together. The heart must be cut open and the blood removed, though if one didn’t cut it open, he doesn’t violate the prohibition against eating blood (to a degree). If one places poultry and cheese on the same table, he doesn’t risk violating the Torah prohibition against meat and milk combinations.

Chulin 8:4

It is prohibited to cook or to derive benefit from the meat of a kosher animal combined with the milk of a kosher animal. When it comes to the meat of a kosher animal with the milk of a non-kosher animal, or the meat of an non-kosher animal with the milk of a kosher animal, it is permitted to cook and to derive benefit from them. Rabbi Akiva says that wild kosher animals and birds are not subject to the prohibition of milk-and-meat combinations under Torah law because the Torah says three times not to cook a kid in its mother’s milk (Exodus 23:19 and 34:26; Deuteronomy 14:21). This excludes wild animals, birds and non-kosher animals. Rabbi Yosi HaGlili observed that Deuteronomy 14:21 also prohibits eating neveila; he infers that whatever is subject to the laws of neveila may also not be cooked with milk. One might think that birds, which are subject to the laws of neveila, may not be cooked with milk under Torah law. However, the Torah says, “in its mother’s milk,” which excludes birds because they don’t produce milk.