Leviticus 5:6

5:6 and he must bring his penalty for guilt to the Lord for his sin that he has committed, a female from the flock, whether a female sheep or a female goat, for a sin offering. So the priest will make atonement on his behalf for his sin.

Leviticus 5:11

5:11 “‘If he cannot afford two turtledoves or two young pigeons, he must bring as his offering for his sin which he has committed a tenth of an ephah of choice wheat flour for a sin offering. He must not place olive oil on it and he must not put frankincense on it, because it is a sin offering.