Reference for Niddah 33:51

תבדוק לאור הנר

all of it becomes clean. Now is not this self contradictory? You first said, 'If a part of it contracted uncleanness all of it does not become unclean', and then you said, 'If a part of it became clean all of it becomes clean', which implies, does it not, that all of it was previously unclean?<span class="x" onmousemove="('comment',' But how is it possible for an uncleanness to have come in contact with all of it? ');">⁴¹</span>

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