Leviticus 5:7; Leviticus 5:11

7 "But if he cannot afford a lamb, then he shall bring to the LORD as his compensation for the sin that he has committed two turtledoves or two pigeons, one for a sin offering and the other for a burnt offering.

11 "But if he cannot afford two turtledoves or two pigeons, then he shall bring as his offering for the sin that he has committed a tenth of an ephah of fine flour for a sin offering. He shall put no oil on it and shall put no frankincense on it, for it is a sin offering.