Leviticus 14:21-22

21If, however, the person is poor and cannot afford these offerings, he is to take one male lamb as a guilt offering to be waved to make atonement for him, along with a tenth of an ephah of fine flour1 mixed with olive oil for a grain offering, a log of olive oil, 22and two turtledoves or two young pigeons, whichever he can afford, one to be a sin offering and the other a burnt offering.