Reference for Niddah 126:24

ראתה אינה צריכה לא לשנות ולא לשלש

<b><i>MISHNAH</i></b>. IF A WOMAN HAD THE HABIT OF OBSERVING HER MENSTRUAL DISCHARGES AT THE ONSET OF THE SYMPTOMS<span class="x" onmousemove="('comment',' In the condition of her body (cf. prev. Mishnah). ');">²⁰</span>

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