Leviticus 15:13-15

13‘When the man with the discharge becomes cleansed from his discharge, he shall count off seven days for his purification; he shall then wash his clothes and bathe his body in running water and will become clean.

14On the eighth day he shall take two turtledoves or two young pigeons 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, one as a sin offering and the other as a burnt offering. So the priest shall make atonement for the man before the Lord because of his discharge.