Reference for Niddah 50:16

אמר אביי

But is it not a fact that when a certain sac was submitted to the Master Samuel he said, 'This is forty-one days old', but on calculating the time since the woman had gone to perform her ritual immersion<span class="x" onmousemove="('comment',' Following the conclusion of her menstrual period. ');">¹⁴</span>

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