Leviticus 5:11-12

But if his means suffice not for two turtle-doves, or two young pigeons, then he shall bring his oblation for that wherein he hath sinned, 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. And he shall bring it to the priest, and the priest shall take his handful of it as the memorial thereof, and burn it on the altar, upon the offerings of Jehovah made by fire: it is a sin-offering.