Reference for Bekhorot 73:57

(דברים טו, כא) כל מום רע חזר וכלל

But why not reason: As the specifications are exposed blemishes which render the animal incapable of carrying out its normal functions<span class="x" onmousemove="('comment',' The lame not being able to walk and the blind to see. Lit., 'idle from its work'.');">²⁸</span>

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