Reference for Bekhorot 10:22

(ירמיהו מז, ג) לא הפנו אבות אל בנים מרפיון ידים

BUT IF AN UNCLEAN ANIMAL GAVE BIRTH TO A SPECIES OF A CLEAN ANIMAL, IT IS FORBIDDEN TO BE EATEN, FOR THAT WHICH GOES FORTH FROM THE UNCLEAN IS UNCLEAN AND THAT WHICH GOES FORTH FROM THE CLEAN IS CLEAN.

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