Reference for Bekhorot 73:26

ר' שמעון בן אלעזר אומר

AND LIKEWISE IF ONE SLAUGHTERED A COW AND SOLD IT AND IT BECAME KNOWN THAT IT WAS TREFAH, AS REGARDS WHAT [THE PURCHASERS] HAVE EATEN THERE IS NO REMEDY, AND AS REGARDS WHAT THEY HAVE NOT EATEN, THEY RETURN THE FLESH TO HIM AND HE MUST RETURN THE MONEY TO THEM.

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