Reference for Chullin 63:45

אם כן נתת דבריך לשיעורין

R'JESHEBAB LAID DOWN THIS RULE IN THE NAME OF R'JOSHUA: WHENEVER AN ANIMAL IS RENDERED INVALID BY A FAULT IN THE SLAUGHTERING IT IS NEBELAH; WHENEVER AN ANIMAL HAS BEEN DULY SLAUGHTERED BUT IS RENDERED INVALID BY SOME OTHER DEFECT IT IS TREFAH.

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