Leviticus 14:18

14:18 and the remainder of the olive oil that is in his hand the priest is to put on the head of the one being cleansed. So the priest is to make atonement for him before the Lord.

Leviticus 14:20

14:20 and the priest is to offer the burnt offering and the grain offering on the altar. So the priest is to make atonement for him and he will be clean.