Leviticus 14:33-42

The LORD spoke to Moses and Aaron: “When you enter the land of Canaan  that I am giving you as a possession,  and I place a mildew contamination in a house in the land you possess,  the owner of the house is to come and tell the priest: Something like mildew contamination has appeared  in my house. The priest must order them to clear the house before he enters to examine the contamination, so that nothing in the house becomes unclean. Afterward the priest will come to examine the house. He will examine it, and if the contamination in the walls of the house consists of green or red indentations  that appear to be beneath the surface of the wall, the priest is to go outside the house to its doorway and quarantine the house for seven days. The priest is to return on the seventh day and examine it. If the contamination has spread on the walls of the house, the priest must order that the stones with the contamination be pulled out and thrown into an unclean place outside the city. He is to have the inside of the house completely scraped, and have the plaster  that is scraped off dumped in an unclean place outside the city. Then they are to take different stones to replace the former ones and take additional plaster to replaster the house.