Leviticus 15:13-15

“When a person with a discharge is cleansed from it, he is to count off seven days for his cleansing, wash his clothes, and bathe in running water. Then he is clean. On the eighth day he is to take two doves or two pigeons and come before GOD at the entrance of the Tent of Meeting and give them to the priest. The priest then offers one as an Absolution-Offering and one as a Whole-Burnt-Offering and makes atonement for him in the presence of GOD because of his discharge.