Leviticus 5:18 in the King James Version
And he shall bring a ram without blemish out of the flock, with thy estimation, for a trespass offering, unto the priest: and the priest shall make an atonement for him concerning his ignorance wherein he erred and wist it not, and it shall be forgiven him.
Context
17 “If anyone sins, doing any of the things which the LORD has commanded not to be done, though he didn’t know it, he is still guilty, and shall bear his iniquity.
18 He shall bring a ram without defect from of the flock, according to your estimation, for a trespass offering, to the priest; and the priest shall make atonement for him concerning the thing in which he sinned and didn’t know it, and he will be forgiven.
19 It is a trespass offering. He is certainly guilty before the LORD.”