Leviticus 14:21-22

21"But if he is poor and cannot afford so much, then he shall take one male lamb for a guilt offering to be waved, to make atonement for him, and a tenth of an ephah of fine flour mixed with oil for a grain offering, and a log of oil;

22also two turtledoves or two pigeons, whichever he can afford. The one shall be a sin offering and the other a burnt offering.