Leviticus 15:28-30 - Purity Regulations From Female Bodily Discharges
28 And when she is cleansed of her issue, let her count her seven days, after that she is clean. 29 And the eighth day let her take two turtles or two young pigeons and bring them unto the priest unto the door of the tabernacle of witness. 30 And the priest shall offer the one for a sin offering, and the other for a burnt offering: and so make an atonement for her before the LORD, as concerning her unclean issue.