Leviticus 19:22

And the priest shall make atonement for him with the ram of the guilt offering before the Lord for his sin that he has committed , and he shall be forgiven for the sin that he has committed .

With the ram of the guilt offering the priest is to make atonement for him before the Lord for the sin he has committed, and his sin will be forgiven.

And the priest shall make an atonement for him with the ram of the trespass offering before the Lord for his sin which he hath done : and the sin which he hath done shall be forgiven him.