Leviticus 14:35 (KJV)

And the Lord spake unto Moses and unto Aaron, saying,

When ye be 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;

And he that owneth the house shall come and tell the priest, saying, It seemeth to me there is as it were a plague in the house:

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

And he shall look on the plague, and, behold, if the plague be in the walls of the house with hollow strakes, greenish or reddish, which in sight are lower than the wall;