Leviticus 14:35

This is the law for him in whom is the plague of leprosy, who is not able to afford the sacrifice for his cleansing.

The LORD spoke to Moses and to Aaron, saying,

“When you have come into the land of Canaan, which I give to you for a possession, and I put a spreading mildew in a house in the land of your possession,

The priest shall command that they empty the house, before the priest goes in to examine the plague, that all that is in the house not be made unclean. Afterward the priest shall go in to inspect the house.

He shall examine the plague; and behold, if the plague is in the walls of the house with hollow streaks, greenish or reddish, and it appears to be deeper than the wall,

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