1 Samuel 13:10-12

10And it came to pass, that as soon as he had made an end of offering the burnt offering, behold, Samuel came; and Saul went out to meet him, that he might salute him.1

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 come down now upon me to Gilgal, and I have not made supplication unto Yhwh: I forced myself therefore, and offered a burnt offering.2