Commentary for Niddah 110:53

אבל זובו רוקו ומימי רגליו מטמאין טומאה חמורה

since in the circumstances it is impossible for the nasal secretion to be free from particles of spittle. R. Johanan, however, stated that it is unclean even if it is drawn and discharged through the nose. It is thus clear that he is of the opinion that the nose is a source,<span class="x" onmousemove="('comment',' In the case of a zab whose sources are unclean. ');">⁴⁷</span>

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