Reference for Yevamot 150:13

א"ר הונא כקולמוס כשרה כמרזב פסולה האי שליט בה אוירא והאי לא שליט בה אוירא ורב חסדא אמר כמרזב כשרה כקולמוס פסולה האי גריד והאי לא גריד

is written, implying, 'at the spot where it discharges',<span class="x" onmousemove="('comment',' Spittle does not flow out of the mouth. ');">¹⁷</span> But might it not refer to one's nose? — It is not written, '[Cut] at the organ that discharges', but 'a cut organ that discharges'; thus implying that organ which in consequence of a cut discharges, and in the absence of a cut does not discharge but flows out. This excludes the nose which in either case<span class="x" onmousemove="('comment',' Even when it is not cut. ');">¹⁸</span>

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