Leviticus 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. 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.
The verse belongs to the law of cleansing in Leviticus 12-15, in which a person or object had to be made visibly clean before the sanctuary's deeper cleansing by blood. It commands the priest to offer one bird for a sin offering and the other for a burnt offering, to make an atonement for the woman before the Lord for the issue of her uncleanness. The surrounding chapter's rules that those who touched the patient or his bed or utensils had to wash and remain isolated until evening, and that the recovered patient had to wait seven days, wash his clothes, and bathe in running water before being considered clean, were simple measures for limiting the spread of infectious disease. These rules of cleanliness and isolation helped prevent epidemics in Israel.
The requirement of priestly offering and atonement before the Lord for the issue shows the exceeding sinfulness of sin. The sin offering and burnt offering were types pointing forward to Jesus Christ, slain beasts pointing forward to the Lamb of God that takes away the sin of the world, whose sacrifice, life, and work supply their fuller meaning. When kept in mind as a mighty object lesson with Christ seen in it, the law's regulatory details are invested with new life and made a blessing to the reader. As part of the broader work of purification given in the laws to ancient Israel, the required cleansing and prescribed offerings serve as examples for the remnant, who must not turn away from cleansing truths including health reform but become clean vessels ready to receive the latter rain.