Leviticus 14:48

And if the priest shall come in, and look upon it, and, behold, the plague hath not spread in the house, after the house was plaistered: then the priest shall pronounce the house clean, because the plague is healed.

Cross-reference

In Leviticus 14:3, the priest examines a leprous person outside the camp — here he examines the house; both follow the same diagnostic pattern for uncleanness.