God also described what to do if “something like a plague” appeared on a house in Canaan. When the owner noticed greenish or reddish streaks that seemed to go deep in the wall, the owner told the priest. Before the priest entered, the house was cleared so its belongings would not become impure.
The priest inspected the walls and then closed the house for seven days. On the seventh day he returned. If the marks had spread, the affected stones were pulled out and thrown outside the city to an impure place. The inside of the house was scraped all around, and the scraped coating was dumped outside the city. New stones were set in, and the house was replastered.
If the plague returned after that, the house was declared impure and torn down, with stones, timber, and plaster carried outside the city. Anyone entering while it was closed became impure until evening. But if the plague did not spread, the priest pronounced the house pure and performed a purging ritual with two birds, fresh water in an earthen vessel, cedar wood, crimson stuff, and hyssop, sprinkling the house seven times and setting the live bird free.