9ט׳
1 א

הַשְּׁחִין וְהַמִּכְוָה מִטַּמְּאִין בְּשָׁבוּעַ אֶחָד, בִּשְׁנֵי סִימָנִים, בְּשֵׂעָר לָבָן וּבְפִשְׂיוֹן. אֵיזֶה הוּא הַשְּׁחִין. לָקָה בְעֵץ אוֹ בְאֶבֶן אוֹ בְגֶפֶת אוֹ בְמֵי טְבֶרְיָא, כֹּל שֶׁאֵינוֹ מֵחֲמַת הָאֵשׁ, זֶה הוּא שְׁחִין. אֵיזוֹ הִיא מִכְוָה. נִכְוָה בְגַחֶלֶת אוֹ בְרֶמֶץ, כֹּל שֶׁהוּא מֵחֲמַת הָאֵשׁ, זוֹ הִיא מִכְוָה:

A boil or a burn may become unclean in a week and by two signs: by white hair or by a spreading. What is a "boil"? An injury received from wood, stone, peat, or the waters of Tiberias, of from any other object whose heat is not due to fire is a boil. What exactly is a "burn"? A burn caused by a live coal, hot embers, or any object whose heat is due to fire is a burning.

2 ב

הַשְּׁחִין וְהַמִּכְוָה אֵין מִצְטָרְפִין זֶה עִם זֶה, וְאֵין פּוֹשִׂין מִזֶּה לָזֶה, וְאֵין פּוֹשִׂין לְעוֹר הַבָּשָׂר, וְלֹא עוֹר הַבָּשָׂר פּוֹשֶׂה לְתוֹכָן. הָיוּ מוֹרְדִין, טְהוֹרִין. עָשׂוּ קְרוּם כִּקְלִפַּת הַשּׁוּם, זוֹ הִיא צָרֶבֶת הַשְּׁחִין הָאֲמוּרָה בַתּוֹרָה. חָזְרוּ וְחָיוּ, אַף עַל פִּי שֶׁמְּקוֹמָן צַלֶּקֶת, נִדּוֹנִין כְּעוֹר הַבָּשָׂר:

A boil and a burn do not combine, nor do they spread from one to the other, nor do they spread from there to the skin of the flesh, nor does [a nega] on the skin of the flesh spread to them. If they were festering they are clean. If they formed a scale as thick as garlic peel, such is the scar of the boil that is spoken of in the Torah. If they were subsequently healed, even though there was a mark in their place, they are regarded as the skin of the flesh.

3 ג

שָׁאֲלוּ אֶת רַבִּי אֱלִיעֶזֶר, מִי שֶׁעָלְתָה לְתוֹךְ יָדוֹ בַּהֶרֶת כַּסֶּלַע וּמְקוֹמָהּ צָרֶבֶת שְׁחִין. אָמַר לָהֶם, יַסְגִּיר. אָמְרוּ לוֹ, לָמָּה, לְגַדֵּל שֵׂעָר לָבָן אֵינָהּ רְאוּיָה, וּלְפִשְׂיוֹן אֵינָהּ פּוֹשָׂה, וּלְמִחְיָה אֵינָהּ מִטַּמָּא. אָמַר לָהֶן, שֶׁמָּא תִכְנֹס וְתִפְשֶׂה. אָמְרוּ לוֹ, וַהֲלֹא מְקוֹמָהּ כַּגְּרִיס. אָמַר לָהֶן, לֹא שָׁמַעְתִּי. אָמַר לוֹ רַבִּי יְהוּדָה בֶן בְּתֵירָא, אֲלַמֵּד בּוֹ. אָמַר לוֹ, אִם לְקַיֵּם דִּבְרֵי חֲכָמִים, הֵין. אָמַר לוֹ, שֶׁמָּא יִוָּלֵד לוֹ שְׁחִין אַחֵר חוּצָה לוֹ וְיִפְשֶׂה לְתוֹכוֹ. אָמַר לוֹ, חָכָם גָּדוֹל אַתָּה שֶׁקִּיַּמְתָּ דִּבְרֵי חֲכָמִים:

They asked R. Eliezer: "[What is the ruling concerning] one who had a bright spot the size of a sela form on the inside of his hand and it covered up the scar of a boil?" He replied: "He should be isolated." They said to him: "Why? Since it is neither capable of growing white hair nor can it effectively spread nor does quick flesh cause it to be unclean?" He replied, "It is possible that it will contract and then spread again." They said to him, "But what about when its only the size of a split bean?' He said to them: I have not heard anything. Rabbi Judah ben Batera said to him, "Can I teach something about this?" He replied, "If you would thereby confirm the ruling of the sages, go ahead." He said, "Lest another boil would arise outside it and spread into it. He replied: "You are a great scholar for you have confirmed the words of the sages."