Leviticus 12:6-8

6When the days of her purification are complete, whether for a son or for a daughter, she is to bring to the priest at the entrance to the Tent of Meeting a year-old lamb for a burnt offering and a young pigeon or a turtledove for a sin offering. 7And the priest will present them before the LORD and make atonement for her; and she shall be ceremonially cleansed from her flow of blood. This is the law for a woman giving birth, whether to a male or to a female.

8But if she cannot afford a lamb, she shall bring two turtledoves or two young pigeons,1 one for a burnt offering and the other for a sin offering. Then the priest will make atonement for her, and she will be clean.’”