Leviticus 15:13-15

13When the man has been cleansed from his discharge, he must count off seven days for his cleansing, wash his clothes, and bathe himself in fresh water,1 and he shall be clean. 14On the eighth day he is to take two turtledoves or two young pigeons, come before the LORD at the entrance to the Tent of Meeting, and give them to the priest. 15The priest is to sacrifice them, one as a sin offering and the other as a burnt offering. In this way the priest will make atonement for the man before the LORD because of his discharge.