They cut off his head, as the Israelites did by Goliath. To publish it in the house of their idols, to give them the glory of this victory.
Related Commentaries of 1 Samuel 31:9
1 Samuel 31:9
9 And they cut off his head, and stripped off his armour, and sent into the land of the Philistines round about, to publish it in the house of their idols, and among the people.