Leviticus 5:17-19

And if any one sin, and do any of the things which Jehovah hath commanded not to be done; though he knew it not, yet is he guilty, and shall bear his iniquity. And he shall bring a ram without blemish out of the flock, according to thy estimation, for a trespass-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. It is a trespass-offering: he is certainly guilty before Jehovah.