Leviticus 5:17-18
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17“Now if a person sins and does any of the things which the Lord has commanded not to be done, though he was unaware, he is still guilty and shall bear his punishment. 18He is then to bring to the priest a 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 unintentionally and did not know it, and it will be forgiven him.