Leviticus 15:29-31

Evangelical Heritage Version

²⁹ On the eighth day she shall take two turtledoves or two pigeons for herself and bring them to the priest at the entrance to the Tent of Meeting. ³⁰ The priest shall offer one dove as a sin offering and the other as a whole burnt offering. This is how the priest is to make atonement for her in the presence of the Lord, from the impurity of her discharge.

³¹ In this way you shall separate the people of Israel from their impurity, so that they do not die in their impurity because they defiled my dwelling place that is in their midst.