I Samuel 13:10-12

Now it happened, as soon as he had finished presenting the burnt offering, that Samuel came; and Saul went out to meet him, that he might greet him. And Samuel said, “What have you done?” Saul said, “When I saw that the people were scattered from me, and that you did not come within the days appointed, and that the Philistines gathered together at Michmash, then I said, ‘The Philistines will now come down on me at Gilgal, and I have not made supplication to the LORD.’ Therefore I felt compelled, and offered a burnt offering.”