Leviticus 5:6-7

⁶and offer he of the flocks a female lamb, either a goat, (for a sin offering); and the priest shall pray for him, and for his sin.

⁷But if he may not offer a beast, offer he two turtles, either two birds of culvers to the Lord, one for the sin, and the tother into burnt sacrifice. (And if he cannot offer such a beast, offer he two turtledoves, or two young pigeons to the Lord, one for a sin offering, and the other for a burnt sacrifice.)