Reference for Niddah 112:22

חזקתו בדוק ש"מ

that it was made before the previous washing. Rabbi said, A stain after its washing is not like a stain before it had been washed, for the former penetrates into the material while the latter remains clotted on its surface. Thus it may be inferred<span class="x" onmousemove="('comment',' From R. Meir's ruling. ');">²⁰</span>

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