Scriptural Sources That Meat and Milk Is Forbidden to Eat and Benefit From

Yalkut Shimoni on Torah 359:5

Rav Ashi said: From where do we learn that meat-and-milk is forbidden to eat? As it is said, "You shall not eat any abomination" (Deuteronomy 14:3) — anything I have made abominable to you falls under "you shall not eat." We have found that it is forbidden to eat; from where that it is forbidden to benefit from? As Rabbi Abbahu said in the name of Rabbi Eleazar: wherever it says "it shall not be eaten," "you shall not eat," or "you shall not eat them," both a prohibition of eating and a prohibition of benefit are implied, until Scripture specifies otherwise, as it specified with a carcass — given to a resident stranger or sold to a foreigner. Resh Lakish said: From where that meat-and-milk is forbidden to benefit from? As it is said, "Do not eat it raw, or boiled at all" (Exodus 12:9) — since the word "boiled" need not have been stated, it teaches that there is another "boiled" thing that is forbidden; and which is it? This is meat-and-milk. Rabbi Yochanan said to him: How ugly is this teaching that Rabbi taught! "You shall not eat" — Scripture speaks of meat-and-milk; or perhaps of any one of the prohibitions in the Torah? You say: go and learn from the thirteen principles by which the Torah is expounded — a matter learned from its context. Of what does Scripture speak? Of two kinds; so here too, of two kinds. And from where benefit? As Rabbi taught: "For you are a holy people" (Deuteronomy 14:21) is said here, and "there shall be no cult prostitute" (Deuteronomy 23:18) is said there — just as there it is a prohibition of benefit, so here a prohibition of benefit. Rabbi Akiva says: wild animal and fowl are not forbidden by the Torah [but only by the Rabbis]. Rabbi Yose the Galilean says likewise. What is between them? Wild animal: Rabbi Yose the Galilean holds wild animal is by Torah law, and Rabbi Akiva holds it is by Rabbinic law. Or, if you prefer: fowl is between them, for Rabbi Akiva holds wild animal and fowl are not from the Torah but are forbidden by the Rabbis, while Rabbi Yose holds fowl is not even forbidden by the Rabbis. It was likewise taught: in the place of Rabbi Yose the Galilean they used to eat fowl in milk.

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