Leviticus 14:20-21

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;