1 Samuel 13:11-15

11But 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,

12therefore, 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.”

13Samuel 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.

14But 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.”

15Then Samuel arose and went up from Gilgal to Gibeah of Benjamin. And Saul assembled and counted the people who were still with him, [only] about six hundred [fighting] men.