Reference for Chullin 248:3

היו עליו:

applies only to the case [where a man touched them] from the outside,<span class="x" onmousemove="('comment',' I.e., he did not actually touch the flesh but only the hide opposite each piece; the hide in such a case cannot serve either as a protection or as a handle to combine the two pieces in order to convey the uncleanness.');">³</span>

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