Leviticus 5:19

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.

18He 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.

19It is a trespass offering. He is certainly guilty before the LORD.”