Leviticus 14:53-57

But he shall let go the living bird out of the city into the open fields, and make an atonement for the house: and it shall be clean.

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.