1 Samuel 13:12-15

therefore said I, Now will the Philistines come down upon me to Gilgal, and I have not entreated the favor of Jehovah: I forced myself therefore, and offered the burnt-offering. And Samuel said to Saul, Thou hast done foolishly; thou hast not kept the commandment of Jehovah thy God, which he commanded thee: for now would Jehovah have established thy kingdom upon Israel for ever. But now thy kingdom shall not continue: Jehovah hath sought him a man after his own heart, and Jehovah hath appointed him to be prince over his people, because thou hast not kept that which Jehovah commanded thee. And Samuel arose, and gat him up from Gilgal unto Gibeah of Benjamin. And Saul numbered the people that were present with him, about six hundred men.