Leviticus 5:17-19

17A person might do wrong things against the Lord. But the person might not know that they were wrong. He is sinning.

18When he knows about it, he must bring a sheep to the priest. The animal must be a perfect male. The sheep must be worth the right amount of money. The priest will give the sheep to the Lord. It will be an atonement for the wrong things that the person has done. Then the Lord will forgive the person.

19The sheep is an offering because the person did not obey the Lord.’