Leviticus 15:15
And the priest shall offer them, the one for a sin offering, and the other for a burnt offering; and the priest shall make an atonement for him before the Lord for his issue.
Cross-references
Leviticus 5:7-10 gives the same two-bird offering for those who cannot afford a lamb, mirroring this sin-and-burnt offering pattern exactly.
Leviticus 14:31 specifies 'one for a sin offering and the other for a burnt offering,' identical to the instruction here for discharge purification.
Leviticus 12:7 describes the same two-bird offering for postpartum purification, showing a consistent ritual for uncleanness.
Leviticus 14:20 follows the sin offering with a burnt offering, just as here, completing the cleansing ritual.
Leviticus 14:19 also prescribes a sin offering for atonement in cleansing a leper, paralleling the use of sin offering here.
Numbers 15:25 shows the sin offering for communal unintentional sin, using the same atonement concept but with a bull instead of birds.