Leviticus 5:9-11

New Catholic Bible

⁹ He shall sprinkle some of the blood of the sin offering on the sides of the altar, while the rest he shall pour out at the base of the altar. This is a sin offering. ¹⁰ The other bird will be offered as a burnt offering, following the normal procedure. Thus the priest shall make atonement for him, for the sin he has committed, and he shall be forgiven.

¹¹ “But if he cannot afford two turtledoves or two young pigeons, let him bring a tenth of an ephah^[a] of fine flour for his sin offering, as the offering for the sin he has committed. He shall not put any oil or incense upon it, for it is a sin offering.