Commentary for Niddah 112:15

ומפני מה אמרו כתם שנמצא בחלוק מטמא למפרע עד שיאמר בדקתי את החלוק ולא היה בו כתם או עד שעת הכבוס

rule that a bloodstain, if found on a shirt, causes uncleanness retrospectively to such time as one can testify, 'I examined this shirt and there was no stain on it', or to such time as it was last washed?<span class="x" onmousemove="('comment',' Sc. why does not the uncleanness begin before the washing? ');">¹⁴</span>

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