Reference for Niddah 112:7

אי אמרת חזקתו בדוק הא לא בדק אי אמרת חזקתו מתכבס הא מתכבס

but if you say that 'it is in the presumptive state of having been properly washed', surely, it had been properly washed.<span class="x" onmousemove="('comment',' And the uncleanness could be retrospective to the time of washing only. ');">⁷</span>

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