one as a sin offering and the other as a burnt offering, together with the grain offering. In this way the priest will make atonement before the LORD for the one to be cleansed.

Leviticus 5:7
If, however, he cannot afford a lamb, he may bring to the LORD as restitution for his sin two turtledoves or two young pigeons--one as a sin offering and the other as a burnt offering.

Leviticus 14:30
Then he must sacrifice the turtledoves or young pigeons, whichever he can afford,

Leviticus 14:32
This is the law for someone who has a skin disease and cannot afford the cost of his cleansing."

Leviticus 15:15
The priest is to sacrifice them, one as a sin offering and the other as a burnt offering. In this way the priest will make atonement for the man before the LORD because of his discharge.

Even such as he is able to get, the one for a sin offering, and the other for a burnt offering, with the meat offering: and the priest shall make an atonement for him that is to be cleansed before the LORD.