1 Samuel 13:11-13

11And Samuel said, What hast thou done? And Saul said, Because I saw that the people were scattered from me, and that thou camest not within the days appointed, and that the Philistines gathered themselves together at Michmash; 12Therefore said I, The Philistines will now come down upon me to Gilgal, and I have not made supplication to the LORD: I forced myself therefore, and offered a burnt offering.1 13And Samuel said to Saul, Thou hast done foolishly: thou hast not kept the commandment of the LORD thy God, which he commanded thee: for now would the LORD have established thy kingdom upon Israel for ever.