Leviticus 5:7-8

⁷And if his means be not sufficient for a sheep, then shall he bring as his offering for the trespass which he hath committed, 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, and he shall offer that which is for the sin-offering first, and pinch off its head by the back of its neck, but shall not divide it asunder: