Commentary for Bekhorot 43:20

רבי פריש של שתי או של ערב

R'Eliezer B'Zadok says: From the time when the ring-like formations [at the mouth of the vagina] are visible.<span class="x" onmousemove="('comment',' R. Eliezer differs from the first Tanna quoted above, for whereas the latter requires for constituting the opening of the uterus that the embryo should form a round head like a coil, the former holds that even if it had not formed a round head but in the period of travailing had reached the stage when ring-like formations were visible, indicating the passage of the embryo's head, we regard it as the opening of the uterus.');">⁹</span>

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