Leviticus 5:7-8

⁷And if his means suffice not for a lamb, then he shall bring his forfeit for that wherein he hath sinned, two turtle-doves, or two young pigeons, unto the LORD: one for a sin-offering, and the other for a burnt-offering.

⁸And he shall bring them unto the priest, who shall offer that which is for the sin-offering first, and pinch off its head close by its neck, but shall not divide it asunder.