Mishnah Negaim 12:7: [The priest] returns at the end of the week and he examines: If it returns, "And he destroys the house, its stones, its wood, and all of the dirt of the house, and removes to the outside of the city to an impure place" (Leviticus 14:45). An adjacent spreading [causes impurity] in any amount or [a spreading] from a distance [if it is] the size of a bean, and a returning Nega in houses [if it is] the size of two beans.

בָּא בְסוֹף שָׁבוּעַ וְרָאָה, אִם חָזַר, וְנָתַץ אֶת הַבַּיִת אֶת אֲבָנָיו וְאֶת עֵצָיו וְאֵת כָּל עֲפַר הַבָּיִת וְהוֹצִיא אֶל מִחוּץ לָעִיר אֶל מָקוֹם טָמֵא (שם). הַפִּסְיוֹן הַסָּמוּךְ, כָּל שֶׁהוּא. וְהָרָחוֹק, כַּגְּרִיס. וְהַחוֹזֵר בַּבָּתִּים, כִּשְׁנֵי גְרִיסִין:

Mishnah Negaim 13:1: There are ten [cases] of houses. If it dulls during the first [week] or goes away, he scrapes it off and it is pure. If it dulls during the second [week] or goes away, he scrapes it off and it requires [sacrificial] birds. If it spreads in the first [week], he removes, scrapes and plasters and gives it a week. If it returns, [the house] must be destroyed. If it does not return, it requires birds. If it stood [unchanged] after the first [week] and spread during the second [week], he removes, scrapes and plasters, and gives it a week. If it returned, the house must be destroyed. If it does not return, it requires birds. If it stood [unchanged] after this [first] and this [second week], he removes, scrapes, and plasters, and gives it a week. If it returns, the house must be destroyed. If it does not return, it requires birds. If before he purified it with birds the Nega [diseased patch on skin, clothes, or houses that creates impurity] reappeared, it must be destroyed. Once it has been purified with birds, if the Nega reappears, it should be examined as if in the beginning [of the Nega].

עֲשָׂרָה בָתִּים הֵן, הַכֵּהֶה בָרִאשׁוֹן, וְהַהוֹלֵךְ לוֹ, קוֹלְפוֹ וְהוּא טָהוֹר. הַכֵּהֶה בַשֵּׁנִי, וְהַהוֹלֵךְ לוֹ, קוֹלְפוֹ וְהוּא טָעוּן צִפֳּרִים. הַפּוֹשֶׂה בָרִאשׁוֹן, חוֹלֵץ וְקוֹצֶה וְטָח וְנוֹתֵן לוֹ שָׁבוּעַ. חָזַר, יִנָּתֵץ. לֹא חָזַר, טָעוּן צִפֳּרִים. עָמַד בָּרִאשׁוֹן וּפָשָׂה בַשֵּׁנִי, חוֹלֵץ וְקוֹצֶה וְטָח וְנוֹתֵן לוֹ שָׁבוּעַ. חָזַר, יִנָּתֵץ. לֹא חָזַר, טָעוּן צִפֳּרִים. עָמַד בָּזֶה וּבָזֶה, חוֹלֵץ וְקוֹצֶה וְטָח וְנוֹתֵן לוֹ שָׁבוּעַ. חָזַר, יִנָּתֵץ. לֹא חָזַר, טָעוּן צִפֳּרִים. אִם עַד שֶׁלֹּא טִהֲרוֹ בַצִּפֳּרִים נִרְאָה בוֹ נֶגַע, הֲרֵי זֶה יִנָּתֵץ. וְאִם מִשֶּׁטִּהֲרוֹ בַצִּפֳּרִים נִרְאָה בוֹ נֶגַע, יֵרָאֶה בַּתְּחִלָּה: