Reference for Bekhorot 91:12

הבא אחר נפלים אע"פ שיצא את ראשו חי

OR WHEN A WOMAN DISCHARGES SOMETHING LIKE AN ANIMAL, BEAST OR BIRD.<span class="x" onmousemove="('comment',' The discharge is regarded as the opening of the womb to release the second offspring from redemption, but it is of no importance as regards inheritance.');">⁸</span>

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