Reference for Niddah 119:47

מה טעם

R. Jose son of R. Hanina ruled, If a clean and an unclean person, and even if a clean, and a doubtfully clean person walked respectively in two paths one of which was unclean and the other clean, it may be assumed, according to the opinion of all,<span class="x" onmousemove="('comment',' Sc. even according to Rabbi. ');">⁴³</span>

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