Reference for Bekhorot 69:53

החשוד על הדבר לא דנו ולא מעידו:

If when the animal eats, [the defect] is not visible,<span class="x" onmousemove="('comment',' The cut in the lips. Firstlings may only he slaughtered on account of open blemishes or defects.');">²⁸</span>

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