Reference for Bekhorot 89:29

היתה בו יתרת וחתכה אם יש בה עצם פסול ואם לאו כשר:

Whence do we deduce that if his fingers lie one above the other or are grown together above<span class="x" onmousemove="('comment',' The 'above' here has the same meaning as 'below' in the MISHNAH:');">¹⁵</span>

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