Leviticus 14:40-44

the priest shall order them to pull out the stones with the spot on them and throw them away at an unclean place outside the city.

And he shall have the house scraped all around inside, and they shall dump the plaster that they scrape off at an unclean place outside the city.

Then they shall take other stones and replace the discarded stones, and he shall take other plaster and replaster the house.

“If, however, the spot breaks out again in the house after he has pulled out the stones and scraped the house, and after it has been replastered,

then the priest shall come in and make an inspection. If he sees that the spot has indeed spread in the house, it is a malignant spot in the house; it is unclean.