Leviticus 5:11

But if he be not able to bring two turtle-doves or two young pigeons, if the condition of poverty be very extreme, then he that sinned shall bring for his offering the tenth part of an ephah of fine flour (about two and one half quarts) for a sin-offering. He shall put no oil upon it, neither shall he put any frankincense thereon, as in the case of the meat-offerings; for it is a sin-offering and, although offered without blood, was permitted in exceptional instances, since it was supplemented by the annual sacrifice on the Day of Atonement.