Leviticus 12:7-8

7Then he shall offer it before the Lord and make atonement for her, and she shall be cleansed from the 1flow of her blood. This is the law for her who bears a child, whether a male or a female.

8But if 2she cannot afford a lamb, then she shall take 3two turtledoves or two young pigeons, 4the one for a burnt offering and the other for a sin offering; and the 5priest shall make atonement for her, and she will be clean.’”