In 1 Samuel 15, King Saul was pretty much a party pooper; God told him to go attack the Amalekites and wipe 'em out, but Saul kept some of the booty and animals, which made God mad. So God told Samuel, the prophet, to confront Saul and he was like, "Bro, why'd you keep the booty? That's not cool." But Saul was all like, "I'm a king, I can do whatever I want." And Samuel was like, "Actually, no. You can't." So God was like, "You're done, Saul. You're outta here." So Saul had to take a hike and David became king. Moral of the story: don't be like Saul.