Reference for Bekhorot 89:46

גזירה שאינה נספרת אטו נספרת

If the additional finger is considered a limb [legally then it should even cause tent uncleanness; and if it is not a limb [legally], then it should not even make a person unclean by contact and by carrying it! - Said R'Huna B'Manoah in the name of R'Aha B'Ika: The Rabbis applied here the rule of a bone which is the size of a barleycorn.<span class="x" onmousemove="('comment',' Which makes a person unclean either by carrying it or coming in contact with it, but does not cause tent uncleanness.');">²⁵</span>

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