Reference for Bekhorot 89:41

עשו דבריהם כדברי נביאות

Said R'Hisda: The following ruling was taught by our great Master [Rab], may the Lord be his support! An additional finger if there is a bone in it, even without a nail, makes a person unclean by contact and by carrying it but i does not cause tent uncleanness.<span class="x" onmousemove="('comment',' Where the additional finger is not in line with the rest, as explained below, there being here two disqualifications; first that there are no nails, and secondly its not being in line with the rest of the fingers. But if it has a nail in it, the additional finger makes tent uncleanness although it is not in line.');">²²</span>

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