Commentary for Bekhorot 18:3

אמר רב

For if it consecrates only when the whole womb touches [a firstling], granted it is impossible to ascertain that both heads came forth simultaneously, nevertheless, there is here an interposition?<span class="x" onmousemove="('comment',' For before one male came forth entirely, the other was on its way out. Therefore, although one came forth prior to the other and was sacred, it did not have the whole womb to consecrate it, owing to the other male, which was coming out at the same time. There was, consequently, an interposition between the first male and the womb.');">²</span>

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