Related for Keritot 3:8

וְעוֹד שְׁאָלָן רַבִּי עֲקִיבָא. אֵבָר הַמְדֻלְדָּל בִּבְהֵמָה, מַהוּ. אָמְרוּ לוֹ, לֹא שָׁמַעְנוּ. אֲבָל שָׁמַעְנוּ בְּאֵבָר הַמְדֻלְדָּל בְּאָדָם, שֶׁהוּא טָהוֹר. שֶׁכָּךְ הָיוּ מֻכֵּי שְׁחִין שֶׁבִּירוּשָׁלַיִם עוֹשִׂין, הוֹלֵךְ לוֹ עֶרֶב פֶּסַח אֵצֶל הָרוֹפֵא וְחוֹתְכוֹ עַד שֶׁהוּא מַנִּיחַ בּוֹ כִשְׂעֹרָה, וְתוֹחֲבוֹ בְסִירָה, וְהוּא נִמְשָׁךְ מִמֶּנּוּ, וְהַלָּה עוֹשֶׂה פִסְחוֹ, וְהָרוֹפֵא עוֹשֶׂה פִסְחוֹ. וְרוֹאִין אָנוּ שֶׁהַדְּבָרִים קַל וָחֹמֶר:

Rabbi Akiva further asked them: What [is the ruling regarding impurity] of a limb hanging loose from [the body of a living] animal? They said to him: We have not heard [any teaching about this matter], but we have heard that a limb hanging loose from [the body of] a man is pure. This is what one afflicted with boils would do in Jerusalem. On the eve of Peasch he would go to the doctor who would cut [the limb] until only a barley-corn [size of flesh] remained. He then stuck it on a thorn and tore himself away from it. Both he [the patient] and the doctor could [subsequently] bring their Passover offerings. And it seems to us that [your case may be understood by employing] a <i>Kal Vachomer</i>.

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