Leviticus 15:14-15

15:14 Then on the eighth day he is to take for himself two turtledoves or two young pigeons, and he is to present himself before the Lord at the entrance of the Meeting Tent and give them to the priest, 15:15 and the priest is to make one of them a sin offering and the other a burnt offering. So the priest is to make atonement for him before the Lord for his discharge.