Reference for Bekhorot 77:37

אין שוחטין אלא על החיצונות בלבד

BUT R'HANINA B. ANTIGONUS SAID: WE DO NOT EXAMINE BEHIND THE MOLARS,<span class="x" onmousemove="('comment',' Lit., 'from the molars and within', as in those teeth a defect is not recognized either when the animal cats or bleats. The molar is called');">²⁰</span>

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