Reference for Bekhorot 13:40

זה וזה גורם מותר ור' יהושע סבר

- This Tanna [from the Baraitha] holds with R'Simeon in one thing but differs from him in the other.<span class="x" onmousemove="('comment',' As regards requiring the head etc. to resemble its mother.');">¹⁹</span>

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