Reference for Niddah 137:24

תחלתן אף על פי שאין סופן הוא דאמרינן דאוקמינהו אחזקייהו אבל סופן אע"פ שאין תחלתן לא קמ"ל

But if 'exclusive of the third day' is not the ruling obvious? — The ruling was necessary only in a case, for instance, where the woman<span class="x" onmousemove="('comment',' Though her discharge ceased on the third day. ');">¹⁸</span>

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