Reference for Niddah 112:16

מפני שחזקת בנות ישראל בודקות חלוקיהן בשעת כבוסיהן ואם לא בדקו הפסידו למפרע

Because there is presumption that the daughters of Israel examine their shirts at the time they are washing them; but if they did not examine them, they impair its presumptive cleanness retrospectively.<span class="x" onmousemove="('comment',' The uncleanness beginning prior to the washing. ');">¹⁵</span>

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