1 Samuel 13:7-13

Also some of the Hebrews had crossed the [river] Jordan to the land of Gad and Gilead. As for Saul, he was still in Gilgal, and all the people followed him, trembling [in fear and anticipation]. Now Saul waited seven days, according to the appointed time which Samuel had set, but Samuel had not come to Gilgal; and the people were scattering away from Saul. So Saul said, “Bring me the burnt offering and the peace offerings.” And he offered the burnt offering [which he was forbidden to do]. As soon as he finished offering the burnt offering, Samuel finally came; Saul went out to meet and to welcome him. But Samuel said, “What have you done?” Saul said, “Since I saw that the people were scattering away from me, and that you did not come within the appointed time, and that the Philistines were assembling at Michmash, therefore, I said, ‘Now the Philistines will come down against me at Gilgal, and I have not asked for the LORD’S favor [by making supplication to Him].’ So I forced myself to offer the burnt offering.” Samuel said to Saul, “You have acted foolishly; you have not kept the commandment of the LORD your God, which He commanded you, for [if you had obeyed] the LORD would have established your kingdom over Israel forever.