Commentary for Niddah 127:28
הכא במאי עסקינן כגון דרגילה למחזי ביום עשרים ושינתה ליום עשרים ואחד
As it might have been presumed that since she was accustomed to observe her discharge on a settled date and this was changed, the change is effective<span class="x" onmousemove="('comment',' Sc. the first date is no longer regarded as a settled period. ');"><sup>26</sup></span>
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