Leviticus 14:20

18The rest of the oil that is in the priest’s hand he shall put on the head of him who is to be cleansed, and the priest shall make atonement for him before the LORD.

19“The priest shall offer the sin offering, and make atonement for him who is to be cleansed because of his uncleanness. Afterward he shall kill the burnt offering;

20then the priest shall offer the burnt offering and the meal offering on the altar. The priest shall make atonement for him, and he shall be clean.

21“If he is poor, and can’t afford so much, then he shall take one male lamb for a trespass offering to be waved, to make atonement for him, and one tenth of an ephah of fine flour mixed with oil for a meal offering, and a log of oil;

22and two turtledoves, or two young pigeons, such as he is able to afford; and the one shall be a sin offering, and the other a burnt offering.