Leviticus 5:6-7

⁶And take to the Lord the offering for the wrong which he has done, a female from the flock, a lamb or a goat, for a sin-offering, and the priest will take away his sin.

⁷And if he has not money enough for a lamb, then let him give, for his offering to the Lord, two doves or two young pigeons; one for a sin-offering and one for a burned offering.