Reference for Bekhorot 10:17

רפידים שמה

<big><b>MISHNAH: </b></big>IF A COW GAVE BIRTH TO A SPECIES OF ASS, OR AN ASS GAVE BIRTH TO A SPECIES OF HORSE, IT IS EXEMPT FROM [THE LAW OF] THE FIRSTLING, FOR IT IS SAID: FIRSTLING [PETER] OF AN ASS',<span class="x" onmousemove="('comment',' Ex. XIII, 13.');">¹⁰</span>

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