Commentary for Niddah 51:30

שופר דתניא כמה יהא שיעור שופר

issued with their feet first; so that the embryo, being animated hangs on and does not easily come out; while the sandal, not being animated, glides and comes speedily out. As regards the law concerning those subject to the penalty of <i>kareth</i> [the reference is to a case] where they issued with their heads first, so that the embryo, being animated is deemed to have consummated its birth as soon as its head came out; while the sandal [being inanimated cannot be deemed to have been born] until its greater part came out.

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