Leviticus 15:13-15

13The pus may stop coming out of a person. When it does, he must count seven days. He must wash his clothes and his body with fresh water. Then the man will be clean.

14On the eighth day, he must come in front of the Lord. He must take two birds to the door of the Tent of Meeting. They must be doves or pigeons. He must give them to the priest.

15The priest will sacrifice them. One bird is for a sin offering and the other is for a burnt offering. They are an atonement to the Lord. Then the man will be clean.