Leviticus 14:40-42

40then the priest shall command that they take out the stones in which is the disease and throw them into an unclean place outside the city.

41And he shall have the inside of the house scraped all around, and the plaster that they scrape off they shall pour out in an unclean place outside the city.

42Then they shall take other stones and put them in the place of those stones, and he shall take other plaster and plaster the house.