1 Samuel 31:6-8

English Standard Version

⁶ Thus Saul died, and his three sons, and his armor-bearer, and all his men, on the same day together. ⁷ And when the men of Israel who were on the other side of the valley and those beyond the Jordan saw that the men of Israel had fled and that Saul and his sons were dead, they abandoned their cities and fled. And the Philistines came and lived in them.

⁸ The next day, when the Philistines came to strip the slain, they found Saul and his three sons fallen on Mount Gilboa.