Reference for Niddah 120:15

ליגזור גבו אטו תוכו קמ"ל

R. Huna citing R. Hanina stated: R. Nehemiah rules that they are clean if they sat even on the back of an earthenware vessel. But is not this obvious?<span class="x" onmousemove="('comment',' Apparently it is, since like a stone bench, the back of an earthenware vessel is not susceptible to uncleanness. ');">¹⁶</span>

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