Reference for Bekhorot 89:47

אי הכי שאינה נספרת באהל נמי תטמא

R'Papa says: We declare him unclean in the case where the additional finger was not counted with the others on account of the case where the additional finger is counted with the others.<span class="x" onmousemove="('comment',' Legally where the additional finger is not in line with the rest, there is no uncleanness, only for fear that this might bring about laxity in a case where the additional finger is in line, where it legally causes uncleanness, the Rabbis declared uncleanness also in the former case.');">²⁶</span>

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