Reference for Ketubot 10:4

ואם תימצי לומר דם מיפקד פקיד לדם הוא צריך ושרי או דלמא לפתח הוא צריך ואסיר

And if you will say [that] the blood is stored up [in the womb, then the question is:] does he need the blood, and it is allowed: or does he need the opening, and it is forbidden?

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