Leviticus 14:54-57

Moses tells the people what these rules are for

54 These are the rules for an illness in a person's skin. 55 These are the rules for mildew in clothes or in a house. 56 These are the rules for a mark on or under the skin. 57 These rules decide when a person has an illness. And they decide when he is clean. They show when a house has an illness. They are the rules for illnesses in the skin and for mildew.