Leviticus 14:21, 22

“If, however, they are poor and cannot afford these, they must take one male lamb as a guilt offering to be waved to make atonement for them, together with a tenth of an ephah of the finest flour mixed with olive oil for a grain offering, a log of oil

and two doves or two young pigeons, such as they can afford, one for a sin offering and the other for a burnt offering.