Reference for Bekhorot 89:39

ובשאינה נספרת על גב היד

and is counted in the number of one hundred and twenty-five [limbs].<span class="x" onmousemove="('comment',' If there is no flesh the size of an olive, the additional finger is counted as a limb among the one hundred and twenty-five limbs and joints, as this constitutes the greater number of limbs of the two hundred and forty-eight limbs and joints of which the human body is composed, the law being that the majority of the joints and limbs of a corpse causes tent uncleanness.');">²¹</span>

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