Leviticus 14:40-42

40then the priest shall command that they take out the stones in which the plague is, and cast them into an unclean place without the city: 41and he shall cause the house to be scraped within round about, and they shall pour out the mortar, that they scrape off, without the city into an unclean place: 42and they shall take other stones, and put them in the place of those stones; and he shall take other mortar, and shall plaster the house.