Leviticus 15:14-15

"'On the eighth day he shall take for himself two turtledoves or two young pigeons, and come before the Lord, to the door of the tabernacle of meeting, and give them to the priest.'"

"'Then the priest shall offer them, the one as a sin offering and the other as a burnt offering. So the priest shall make atonement for him before the Lord because of his discharge.'"

(They really do cover about everything in the laws of this covenant.)