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ואת כי שטית אין לי אלא כדרכה, שלא כדרכה מנין תלמוד לומר וכי נטמאת. ויתן איש בך את שכתבו להביא את הסריס. מבלעדי אישך להביא את אשת הסריס על הכל היה מתנה עמה: (Bamidbar 5:20) "And you, if you have gone astray": This tells me only of the regular mode. Whence do I derive (that the same applies for) the irregular mode (i.e., anal intercourse)? From "and if you have become unclean." "and a man has put his lying in you": to include (in these strictures) one who is impotent, (where there is only "lying," but no seed.) "aside from your husband": to include the wife of one who is impotent. He stipulates all (contingencies) with her.