Leviticus 14:37-39

New King James Version

³⁷ And he shall examine the plague; and indeed if the plague is on the walls of the house with ingrained streaks, greenish or reddish, which appear to be ^[a]deep in the wall, ³⁸ then the priest shall go out of the house, to the door of the house, and ^[b]shut up the house seven days. ³⁹ And the priest shall come again on the seventh day and look; and indeed if the plague has spread on the walls of the house,