Reference for Niddah 34:19

תני רבי חייא

it is deemed unclean", but have we not learnt: BECAUSE IT IS PRESUMED TO HAVE COME FROM THE SOURCE?'<span class="x" onmousemove="('comment',' Emphasis on PRESUMED. If it is presumed to originate from the source (sc. the chamber) the uncleanness could not be described as a matter of 'doubt' but as one of certainty. ');">¹⁶</span>

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