Leviticus 14:34-38

34‘Canaan is my gift to you, to belong to you for ever. When you go into that land, I may put a disease called mildew in a house there.

35If a person finds mildew in his house, he must tell the priest. He must say, “I have found something like mildew in my house.”

36The priest will tell the person what he should do. The person must take everything out of the house. If he does, those things will still be clean. Then the priest will go into the house.

37He will look at the walls of the house. He will look for a green or red mark. If the mark goes into the wall,

38the priest will leave the house. He will shut it up for seven days.