I have sinned against the Lord - 2 Samuel 12:!3
King David in a space of a few weeks - lusted, commited adultery, lied, and murdered his lyal servant Uriah
God called David a man after his own heart, not because he was perfect - 1 Samuel 13:14
God call him this because David humbly and brokenheartedly recongnized his own sin and knew what to do
When the prophet Nathan confronted David about his sin, the king acknowledged he had sinned against the Lord