Leviticus 15:13-15

13"And when the one with a discharge is cleansed of his discharge, then he shall count for himself seven days for his cleansing, and wash his clothes. And he shall bathe his body in fresh water and shall be clean.

14And on the eighth day he shall take two turtledoves or two pigeons and come before the Lord to the entrance of the tent of meeting and give them to the priest.

15And the priest shall use them, one for a sin offering and the other for a burnt offering. And the priest shall make atonement for him before the Lord for his discharge.