Reference for Bekhorot 66:54

בעל מום מעיקרו פשיטא דיקלא בעלמא הוא

And as regards the Rabbis, does not Scripture write: 'There shall be no blemish therein'? - [This text] forbids causing a blemish even indirectly, for it has been taught:<span class="x" onmousemove="('comment',' Bez. 27b, Men. 56b.');">³⁴</span>

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