Leviticus 14:9

14:9 When the seventh day comes he must shave all his hair – his head, his beard, his eyebrows, all his hair – and he must wash his clothes, bathe his body in water, and so be clean.

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.