Leviticus 12:7-8

7The priest will offer them in the Lord’s presence to make peace with the Lord for her. Then she will be clean from her flow of blood. “These are the instructions for the woman who gives birth to a boy or a girl.

8If she cannot afford a lamb, she must use two mourning doves or two pigeons. One will be the burnt offering and the other the offering for sin. So the priest will make peace with the Lord for her, and she will be clean.”