Leviticus 5:7-8

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.

⁸And he shall bring them unto the priest, who shall present that which is for the sin-offering first, and pinch off his head at the neck, but shall not divide it;