Reference for Niddah 138:8

אמר ליה רב אחא בריה דרב יוסף לרב אשי

— In respect of <i>zibah</i> where the number of immersions is fixed, since it does not vary whether she appeared before us in the day time or at night, [the eighth immersion] was counted, but in respect of menstruation where the number is not fixed, for only where she appeared before us at night does she require eight immersions while if she appeared before us in the day time she does not require eight [the eighth immersion] was not counted. Now, if it could be entertained that it is necessary for all the counting to take place in our presence, what need is there<span class="x" onmousemove="('comment',' In respect of zibah, ');">⁷</span>

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