Mishnah Negaim 13:4: A quarantined house causes impurity from its inside, and a [house] designated [to be destroyed] from its inside and from its outside. Both this and that [types of house] make one impure by entering it.

בַּיִת הַמֻּסְגָּר, מְטַמֵּא מִתּוֹכוֹ. וְהַמֻּחְלָט, מִתּוֹכוֹ וּמֵאֲחוֹרָיו. זֶה וָזֶה מְטַמְּאִין בְּבִיאָה:

Mishnah Negaim 13:5: One who builds a pure house [with bricks] from a quarantined house, and the Nega returned to the house, he removes those stones. If it returned to the stones, the first house should be destroyed and the new stones should serve as indicators for the second house.

הַבּוֹנֶה מִן הַמֻּסְגָּר בְּטָהוֹר, וְחָזַר נֶגַע לַבַּיִת, חוֹלֵץ אֶת הָאֲבָנִים. חָזַר עַל הָאֲבָנִים, הַבַּיִת הָרִאשׁוֹן יִנָּתֵץ, וְהָאֲבָנִים יְשַׁמְּשׁוּ אֶת הַבַּיִת הַשֵּׁנִי בְּסִימָנִין: