Leviticus 14:9; Leviticus 14:20

9 "It will be on the seventh day that he shall shave off all his hair: he shall shave his head and his beard and his eyebrows , even all his hair. He shall then wash his clothes and bathe his body in water and be clean.

20 "The priest shall offer up the burnt offering and the grain offering on the altar. Thus the priest shall make atonement for him, and he will be clean.