1 Samuel 13:8-14

He waited seven days for Samuel, as Samuel had instructed him to do, but Samuel still had not come to Gilgal. The people began to desert Saul, so he said to them, “Bring me the burnt sacrifices and the fellowship sacrifices.” He offered a burnt sacrifice, and just as he was finishing, Samuel arrived. Saul went out to meet him and welcome him, but Samuel said, “What have you done?” Saul answered, “The people were deserting me, and you had not come when you said you would; besides that, the Philistines are gathering at Michmash. So I thought, ‘The Philistines are going to attack me here in Gilgal, and I have not tried to win the LORD's favour.’ So I felt I had to offer a sacrifice.” “That was a foolish thing to do,” Samuel answered. “You have not obeyed the command the LORD your God gave you. If you had obeyed, he would have let you and your descendants rule over Israel for ever. But now your rule will not continue. Because you have disobeyed him, the LORD will find the kind of man he wants and make him ruler of his people.”