Leviticus 5:7-11

‘But if he cannot afford a lamb, then he shall bring to the Lord his guilt offering for that in which he has sinned, two turtledoves or two young doves, one as a sin offering and the other as a burnt offering.

He shall bring them to the priest, who shall first offer that which is for the sin offering, and shall pinch off its head at the front of its neck, but he shall not sever it.

He shall also sprinkle some of the blood of the sin offering on the side of the altar, while the rest of the blood shall be drained out at the base of the altar: it is a sin offering.

The second he shall then prepare as a burnt offering according to the ordinance. So the priest shall make atonement on his behalf for his sin which he has committed, and it will be forgiven him.

‘But if his means are insufficient for two turtledoves or two young doves, then for his offering for that which he has sinned, he shall bring the tenth of an ephah of fine flour as a sin offering; he shall not put oil on it or place incense on it, for it is a sin offering.