Leviticus 14:34-38

34“When you arrive in Canaan, the land I am giving you as your own possession, I may contaminate some of the houses in your land with mildew.

35The owner of such a house must then go to the priest and say, ‘It appears that my house has some kind of mildew.’

36Before the priest goes in to inspect the house, he must have the house emptied so nothing inside will be pronounced ceremonially unclean.

37Then the priest will go in and examine the mildew on the walls. If he finds greenish or reddish streaks and the contamination appears to go deeper than the wall’s surface,

38the priest will step outside the door and put the house in quarantine for seven days.