Reference for Niddah 119:38

ורב חסדא סוף סוף איהי טבילה בעיא

R. Hisda stated: If a clean and an unclean person walked respectively in two paths one of which was clean and the other unclean,<span class="x" onmousemove="('comment',' And it is unknown who walked in which. ');">³⁴</span>

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