Leviticus 5:17-19

17And if any one sin, and do any of the things which the LORD hath commanded not to be done; though he knew it not, yet is he guilty, and shall bear his iniquity. 18And he shall bring a ram without blemish out of the flock, according to thy estimation, for a guilt offering, unto the priest: and the priest shall make atonement for him concerning the thing wherein he erred unwittingly and knew it not, and he shall be forgiven. 19It is a guilt offering: he is certainly guilty before the LORD.