If you will fear Yahweh, and serve him, and listen to his voice, and not rebel against the commandment of Yahweh, and both you and also the king who reigns over you are followers of Yahweh your God, [well]:
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.