Leviticus 14:42-45

Then they are to take other stones to replace these and take new clay and plaster the house. “If the defiling mold reappears in the house after the stones have been torn out and the house scraped and plastered, the priest is to go and examine it and, if the mold has spread in the house, it is a persistent defiling mold; the house is unclean. It must be torn down—its stones, timbers and all the plaster—and taken out of the town to an unclean place.