Leviticus 5:6-7

6and he shall bring his trespass-offering to Jehovah for his sin which he hath sinned, a female from the small cattle, a sheep or doe goat, for a sin-offering; and the priest shall make atonement for him [to cleanse him] from his sin.

7And if his hand be not able to bring what is so much as a sheep, then he shall bring for his trespass which he hath sinned two turtle-doves or two young pigeons, to Jehovah; one for a sin-offering, and the other for a burnt-offering.