Leviticus 14:20-21

²⁰And the priest shall offer the burnt-offering and the meal-offering upon the altar; and the priest shall make atonement for him, and he shall be clean.

²¹And if he be poor, and his means suffice not, then he shall take one he-lamb for a guilt-offering to be waved, to make atonement for him, and one tenth part of an ephah of fine flour mingled with oil for a meal-offering, and a log of oil;