Midrash for Bekhorot 91:21
(שמות יג, יב) פטר רחם בישראל עד שיפטרו רחם מישראל
R'JOSE THE GALILEAN SAYS HOWEVER: [THE INFANT] IS A FIRST-BORN [WITH RESPECT] TO INHERITANCE AND ALSO ONE WHO MUST BE REDEEMED FROM A PRIEST, BECAUSE IT IS SAID IN THE SCRIPTURES: OPENETH THE WOMB AMONG THE CHILDREN OF ISRAEL,<span class="x" onmousemove="('comment',' Ex. XIII, 2.');"><sup>16</sup></span>
Sifrei Devarim
"… over the face of the son of the hated one": We are hereby taught that if his head or most of it emerged live (from the womb), he negates the next birth as a first-born.
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