Said R’ Akiva: I asked Rabban Gamliel and R’ Yehoshua in the meat market of Emmaus when they went to purchase an animal for Rabban Gamliel’s son’s feast: One who cohabits with his sister, his father’s sister, and his mother’s sister, in one lapse of awareness — what is he [liable for]? Is he liable to one [chatas] for all of them or one for each? And they replied to me: [This] we have not heard, but we have heard that one who cohabits with his five menstruous wives, in a single lapse of awareness, is liable for each one, and we believe that the matter is a kal vachomer.

R’ Akiva asked them further: A dangling limb of an animal — what is it [considered]? They replied to him: [This] we have not heard, but we have heard that a dangling limb of a human is tahor, for so were the lepers in Jerusalem wont to do: He would go to a surgeon on the eve of Pesach, and [the latter would] sever it until he would leave over a barleycorn’s breadth and impale it on a thorn, and he would pull away from it. Then, that person would make his pesach [-offering] and the surgeon would make his pesach [-offering], and we believe that the matter is a kal vachomer.