Leviticus 5:6-7

6and he shall bring his trespass offering to the Lord for his sin which he has committed, a female from the flock, a lamb or a kid of the goats as a sin offering. So the priest shall make atonement for him concerning his sin.

7‘If he is not able to bring a lamb, then he shall bring to the Lord, for his trespass which he has committed, two turtledoves or two young pigeons: one as a sin offering and the other as a burnt offering.