Reference for Bekhorot 13:37

אבל אתה אוכל הבא בסימן אחד

And R'Jeremiah explained that the animal became pregnant from a kalut born of a cow,<span class="x" onmousemove="('comment',' The unclean animal referred to in the Baraitha above, does not actually mean an unclean animal but a kalu! (closed) , an animal with closed and uncloven hoofs born of a cow.');">¹⁶</span>

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