Leviticus 14:21-22

21“But anyone who is too poor and cannot afford these offerings may bring one male lamb for a guilt offering, to be lifted up as a special offering for purification. The person must also bring two quarts of choice flour moistened with olive oil for the grain offering and a cup of olive oil.

22The offering must also include two turtledoves or two young pigeons, whichever the person can afford. One of the pair must be used for the sin offering and the other for a burnt offering.