Reference for Bekhorot 13:30

והאמר ר' יהושע בן לוי

and proceeds to say, 'But you may eat an animal which possesses one [clean] mark similar to its mother'! - This Tanna [of the above passage] holds with R'Simeon in one thing<span class="x" onmousemove="('comment',' That an unclean animal born from a clean animal is unclean.');">¹²</span>

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