Only fear Yahweh, and serve him in truth with all your heart; for consider how great things he has done for you.
In other words, he is declaring his innocency before the people. "Look, I didn't take from you at all. I didn't take from you your oxen, your donkeys. I didn't accept bribes. I've not oppressed you. If anyone feels that I've oppressed you, anyone feels I've defrauded, step forward, and I will pay." Really Samuel did have a very beautiful and remarkable career as the judge of Israel. Extremely outstanding person.