Leviticus 15:14-15

14Then on the eighth day he shall take for himself 1two turtledoves or two young doves, and come before the Lord to the doorway of the tent of meeting and give them to the priest; 15and the priest shall offer them, 2one as a 3sin offering and the other as a burnt offering. So 4the priest shall make atonement on his behalf before the Lord because of his discharge.