Leviticus 14:42

40Then the priest shall command that they take away the stones in which the plague is, and they shall 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 dust 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 morter, and shall plaister the house.

43And if the plague come again, and break out in the house, after that he hath taken away the stones, and after he hath scraped the house, and after it is plaistered;

44Then the priest shall come and look, and, behold, if the plague be spread in the house, it is a fretting leprosy in the house; it is unclean.