Leviticus 15:28-31

28When she becomes clean from her discharge, she shall count off for herself seven days; and afterward she will be clean. 29Then on the eighth day she shall take for herself two turtledoves or two young doves, and bring them to the priest, to the doorway of the tent of meeting. 30And the priest shall offer the 1one as a 2sin offering, and the other as a burnt offering. So the priest shall make atonement on her behalf before the Lord because of her impure discharge.’

31“And so you shall keep the sons of Israel separated from their uncleanness, so that they will not die in their uncleanness by their 3defiling My 4tabernacle that is among them.”