Reference for Bekhorot 13:28

ואיכא דמקשי ומותיב

Scripture therefore states: 'a sheep of lambs', 'a sheep of goats' in any case.<span class="x" onmousemove="('comment',' From the repetition of the word 'seh', it is inferred that even if the unclean animal has only a mother which is a clean animal, the father being an unclean animal, it is still permitted.');">¹⁰</span>

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