Leviticus 14:36

33 Yahweh spoke to Moses and to Aaron, saying,

34 When you are come into the land of Canaan, which I give to you for a possession, and I put the plague of leprosy in a house of the land of your possession;

35 then he who owns the house shall come and tell the priest, saying, There seems to me to be as it were a plague in the house.

36 The priest shall command that they empty the house, before the priest goes in to see the plague, that all that is in the house not be made unclean: and afterward the priest shall go in to see the house:

37 and he shall look on the plague; and, behold, if the plague be in the walls of the house with hollow streaks, greenish or reddish, and the appearance of it be lower than the wall;

38 then the priest shall go out of the house to the door of the house, and shut up the house seven days.

39 The priest shall come again the seventh day, and shall look; and, behold, if the plague be spread in the walls of the house;