Leviticus 5:11

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 .

“‘If, however, they cannot afford two doves or two young pigeons, they are to bring as an offering for their sin a tenth of an ephah of the finest flour for a sin offering. They must not put olive oil or incense on it, because it is a sin offering.

But if he be not able to bring two turtledoves, or two young pigeons, then he that sinned shall bring for his offering the tenth part of an ephah of fine flour for a sin offering; he shall put no oil upon it, neither shall he put any frankincense thereon: for it is a sin offering.