Leviticus 12:7-8

7Then he shall offer it before the Lord, and make atonement for her. And she shall be clean from the flow of her blood. This is the law for her who has borne a male or a female.

8‘And if she is not able to bring a lamb, then she may bring two turtledoves or two young pigeons—one as a burnt offering and the other as a sin offering. So the priest shall make atonement for her, and she will be clean.’ ”