1 Samuel 15:22-23

22But Samuel said, ‘What makes the Lord happy? Which is better? Is he more pleased when people offer burnt offerings and sacrifices to him? Or is he more pleased when people obey him? Listen! It is better to obey the Lord than to offer sacrifices to him. That is true even if you offer to him the best animals that you have.

23You have turned against God. That is worse than using magic. You think that you know what is right better than God does. That is as bad as worshipping idols. You decided not to obey the Lord's command. Now the Lord has decided that you will not be king any longer.’