Reference for Niddah 76:22

אלא אמר רבא הכי קאמר

without giving birth to it is in <i>zibah</i>.<span class="x" onmousemove="('comment',' Since a child causes the cleanness of fourteen days only (that immediately precede its birth), thus leaving twelve days at the beginning of the period of twenty-six days, there remain three days (between the first seven days of menstruation and the last fourteen) in the course of which she becomes a major zabah. ');">²⁰</span>

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