Leviticus 15:28-30

15:28 But if she be cleansed of her issue, then she shall number to herself seven days, and after that she shall be clean. 15:29 And on the eighth day she shall take unto her two turtles, or two young pigeons, and bring them unto the priest, to the door of the tabernacle of the congregation. 15:30 And the priest shall offer the one [for] a sin offering, and the other [for] a burnt offering; and the priest shall make an atonement for her before the LORD for the issue of her uncleanness.