Agag

King of the Amalekites during Saul's reign. God commanded Saul to completely destroy the Amalekites and everything they had, but Saul spared Agag and the best livestock (1 Samuel 15). The prophet Samuel confronted Saul for this disobedience — 'To obey is better than sacrifice' — then executed Agag himself. This incident cost Saul the kingdom and became the defining example of half-hearted obedience.