Leviticus 12:7-8

Revised Standard Version Catholic Edition

⁷ and he shall offer it before the Lord, and make atonement for her; then she shall be clean from the flow of her blood. This is the law for her who bears a child, either male or female. ⁸ And if she cannot afford a lamb, then she shall take two turtledoves or two young pigeons, one for a burnt offering and the other for a sin offering; and the priest shall make atonement for her, and she shall be clean.”