Reference for Niddah 98:15

אמר רבה בר בר חנה א"ר יוחנן

may the Omnipresent be his help. A redundant finger that contains a bone but grows no nail conveys uncleanness<span class="x" onmousemove="('comment',' If the bone is not smaller than a barley-grain. ');">¹²</span>

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