Leviticus 5:17-19

17“Now if a person sins and does any of the things 1which the Lord has commanded not to be done, 2though he was unaware, he is still guilty and shall bear his punishment.

18He is then to bring to the priest 3a ram without defect from the flock, according to your assessment, as a guilt offering. So the priest shall make atonement for him concerning his sin which he committed 4unintentionally and did not know it, and it will be forgiven him.

19It is a guilt offering; he was certainly guilty before the Lord.”