Leviticus 5:11-12

11“But if you cannot afford two mourning doves or two pigeons, then bring eight cups of flour as an offering for the sin you committed. Never put olive oil on it or add incense to it, because it is an offering for sin.

12Bring it to the priest. The priest will take a handful of it. He will burn it as a reminder on top of the offering by fire to the Lord on the altar. It is an offering for sin.