Leviticus 6:4

6:4 when it happens that he sins and he is found guilty, then he must return whatever he had stolen, or whatever he had extorted, or the thing that he had held in trust, or the lost thing that he had found,

Leviticus 6:7

6:7 So the priest will make atonement on his behalf before the Lord and he will be forgiven for whatever he has done to become guilty.”