1 Samuel 13:11-14

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. But now your kingdom shall not endure. The LORD has sought out for Himself a man (David) after His own heart, and the LORD has appointed him as leader and ruler over His people, because you have not kept (obeyed) what the LORD commanded you.”