Leviticus 14:19-20

19Then the priest must offer the sin offering. That will make atonement for the man who will become clean. Then the priest must kill another sheep. It is a burnt offering.

20The priest must sacrifice the dead animal. It is a burnt offering. The priest must offer it on the altar. He must burn the flour and the oil with it on the altar. All this will make atonement for the person. This makes the person who had the disease clean.