Leviticus 15:28-30

“When she is cleansed from her discharge, she is to count off seven days; then she is clean. On the eighth day she is to take two doves or two pigeons and bring them to the priest at the entrance to the Tent of Meeting. The priest will offer one for an Absolution-Offering and the other for a Whole-Burnt-Offering. The priest will make atonement for her in the presence of GOD because of the discharge that made her unclean.