Reference for Avodah Zarah 47:8

וניחוש דלמא רבעוה לאמא מעיקרא דתנן כל הפסולין לגבי מזבח ולדותיהן מותרין ותני עלה ר' אליעזר אוסר

Let us be concerned that they had bestiality with them mother, for we have learned: All [animals] which are forbidden to be offered on the altar — their young are permitted. And on this it was taught that R. Eliezer forbade.

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