Leviticus 14:37-42

37He is to examine the mold on the walls, and if it has greenish or reddish depressions that appear to be deeper than the surface of the wall,

38the priest shall go out the doorway of the house and close it up for seven days.

39On the seventh day the priest shall return to inspect the house. If the mold has spread on the walls,

40he is to order that the contaminated stones be torn out and thrown into an unclean place outside the town.

41He must have all the inside walls of the house scraped and the material that is scraped off dumped into an unclean place outside the town.

42Then they are to take other stones to replace these and take new clay and plaster the house.