Reference for Bekhorot 14:43

אי תניא תניא:

BUT IF A CLEAN FISH HAS SWALLOWED AN UNCLEAN FISH, THE LATTER IS FORBIDDEN TO BE EATEN, BECAUSE IT IS NOT [THE CLEAN FISH'S] PRODUCT.<span class="x" onmousemove="('comment',' For the unclean fish was swallowed alive, but if it was actually a growth of the clean fish, it would be permitted, as is the ruling with something which proceeds from a clean being.');">²²</span>

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