Reference for Niddah 132:20

איכא בינייהו

Rabin son of R. Adda citing R. Isaac stated: It once happened that a bondmaid of Rabbi performed immersion and when she ascended [from the water] a bone constituting an interposition was found between her teeth, and<span class="x" onmousemove="('comment',' Though it is not necessary for the water to come in contact with the teeth. ');">²⁰</span>

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