Leviticus 14:2, 54-57

This shall be the law of the leper in the day of his cleansing: He shall be brought unto the priest

This is the law for all manner of plague of leprosy, and scall, and for the leprosy of a garment, and of a house, and for a rising, and for a scab, and for a bright spot: to teach when it is unclean, and when it is clean: this is the law of leprosy.