Reference for Bekhorot 42:6

גואל מום תמורת אכילה

Why not deduce it from the case of dedicated animals?<span class="x" onmousemove="('comment',' Where not only is the animal disqualified for sacrifice before its due time but it is even not invested with any sanctity if consecrated before the expiration of the seven days after birth.');">³</span>

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