Reference for Niddah 96:23

אף תוך הפרק נשים בודקות אותן

The Master said, 'R. Judah ruled: Before the period and after the period women examine them'. One can well concede that before the period an examination is required, for should [the same hairs]<span class="x" onmousemove="('comment',' And no others. ');">¹⁸</span>

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