Reference for Niddah 66:26

שבקיה ואתא לקמיה דרב שימי בר אשי

And if the uncleanness were to be attributed to his likely intercourse with a menstruant [it could be objected]: It is doubtful whether he had his intercourse recently or some time ago.<span class="x" onmousemove="('comment',' In the latter case his uncleanness may have terminated before he performed the immersion and he is now clean. ');">²⁵</span>

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