If you can't afford an animal from the flock, you can bring to the LORD as compensation for your sin two doves or two pigeons, one as a purification offering and the other as an entirely burned offering.
References for Leviticus 5:7
You will bring them to the priest, who will first present the one for the purification offering. He will pinch off its head at the back of its neck without splitting it.
Then he will sprinkle some of the blood of the purification offering on the side of the altar. The rest of the blood will be drained out at the base of the altar. It is a purification offering.
Then, with the second bird, the priest will perform an entirely burned offering according to the regulation. In this way, the priest will make reconciliation for you because of the sin you committed, and you will be forgiven.
If you cannot afford two doves or two pigeons, you can bring as the offering for your sin a tenth of an ephah of choice flour as a purification offering. You must not put any oil on it, nor any frankincense, because it is a purification offering.
References for Leviticus 5:11
You will bring it to the priest, and the priest will take a handful from it—the token portion—and will burn it completely on the altar along with the food gifts for the LORD. It is a purification offering.
In this way, the priest will make reconciliation for you for whichever one of the sins you committed, and you will be forgiven. The rest of the offering will belong to the priest like the grain offering.