Reference for Keritot 30:13

והיכא איתמר דרב יוסף

or one rendered unclean through contact with a dead body was walking while the rain fell upon him, though the water was squeezed by him from the upper towards the lower part [of his clothes], it is regarded as clean, for it is of no consequence so long as it is not wholly removed from the clothes.<span class="x" onmousemove="('comment',' The water running down the clothes gathers in the hem and evaporates. It is therefore regarded as unsubstantial to be the carrier of defilement, unless it had been purposely removed from the clothes.');">¹¹</span>

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