Leviticus 14:34-38

34“Suppose you have come into the land of Canaan, which I give to you for a possession, and I put a mark of tza'arat in a house in the land you possess.

35Then the one who owns the house shall come and tell the kohen, saying: ‘Something like a mark has appeared in my house.’

36The kohen is to order the house emptied before he goes in to examine the mark, so that nothing in the house might be made unclean. Then afterward the kohen is to enter to inspect the house.

37He is to examine the mark, and behold, if the mark is in the walls of the house with hollow streaks, greenish or reddish, and appears deeper than the wall,

38then the kohen is to go out of the house to the door and close up the house for seven days.