Commentary for Avodah Zarah 47:19
מיתיבי (שמות י, כה) ויאמר משה גם אתה תתן בידנו זבחים ועולות קודם מתן תורה שאני
They raised an objection: “And Moses said: You must also give into our hand sacrifices and burnt-offerings” (Exodus 10:25). It was different before the giving of the Torah.
Daf Shevui to Avodah Zarah
Moses tells Pharaoh that he must provide him with sacrifices which they will offer to God in the wilderness. This proves that animals can be received from non-Jews. The Talmud says that the law was different before the giving of the Torah. The Torah is what prohibits taking animals as sacrifices from non-Jews.
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