1 Samuel 31:9

And they cut off his head, and stripped off his armour. — Only Saul’s head and armour is mentioned here, but on comparing 1 Samuel 31:12, where the bodies of his sons are especially mentioned, it is clear that this act was not confined to the person of the king. The sense of the passage there is, the heads of the king and his three sons were cut off, and their armour stripped from their bodies. The heads and armour were sent as trophies round about the different towns and villages of Philistia, and the headless corpses were fastened to the wall of the city of Beth-shan.