Leviticus 5:9-11

Living Bible

⁹ Then he shall sprinkle some of the blood at the side of the altar and the rest shall be drained out at the base of the altar; this is the sin offering. ¹⁰ He shall offer the second bird as a burnt offering, following the customary procedures that have been set forth; so the priest shall make atonement for him concerning his sin, and he shall be forgiven.

¹¹ “If he is too poor to bring turtledoves or young pigeons as his sin offering, then he shall bring a tenth of a bushel of fine flour. He must not mix it with olive oil or put any incense on it because it is a sin offering.