1 Samuel 31:6-8

New Catholic Bible

⁶ So Saul and his three sons and his armor-bearer and all of his men died together on the same day. ⁷ When the Israelites on the other side of the valley and those on the other side of the Jordan saw that the Israelites had fled and that Saul and his sons were dead, they abandoned the cities, and the Philistines came and occupied them.

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