Reference for Bekhorot 89:35

ובנספרת על גב היד

Rabbah B'bar Hana reported in the name of R'Johanan: Provided the additional finger is counted with the others.<span class="x" onmousemove="('comment',' I.e., is in line with the rest of the fingers, it is then that the Mishnah regards it as a limb.');">¹⁷</span>

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