Commentary for Niddah 138:17

כל הנשים מתות נדות

But if she stated, 'I counted and know not how many days I counted', it is at any rate impossible that she should not have counted one day, at least, is she then not short of one immersion?<span class="x" onmousemove="('comment',' Obviously she is; why then was the number given fifteen and not fourteen? ');">¹⁶</span>

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