Leviticus 14:38-40

The Voice

³⁸ then the priest will exit the house through the door and quarantine the house for seven days. ³⁹ When the seventh day arrives, the priest will go back into the house and inspect it again. If the discolored spot has shown up on other places on the walls, ⁴⁰ the priest will direct them to remove all the stones that have any suspicious spots on them and discard them in the impure refuse pile outside the camp.