Reference for Chullin 66:17

הכניס ידיו לבית המנוגע ידיו תחלות דברי רבי עקיבא וחכמים אומרים

Now all accept the principle that an entry by part of the person only is no entry,<span class="x" onmousemove="('comment',' Therefore the person himself is not rendered unclean, and on the same principle his hands too should not be rendered unclcan. The Rabbis, however, decreed that the latter be unclean as a precautionary measure against it being said: If hands when brought into a house stricken with leprosy remain clean, the body too should be clean!');">¹¹</span>

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