Leviticus 15:13-15

13“ ‘When a man is cleansed from his discharge, he is to count off seven days for his ceremonial cleansing; he must wash his clothes and bathe himself with fresh water, and he will be clean.

14On the eighth day he must take two doves or two young pigeons and come before the Lord to the entrance to the tent of meeting and give them to the priest.

15The priest is to sacrifice them, the one for a sin offering and the other for a burnt offering. In this way he will make atonement before the Lord for the man because of his discharge.