1 Samuel 17:51-52

51David then ran and stood over Goliath. He pulled Goliath's sword out and he killed him. Then he used it to cut off Goliath's head. The Philistines saw that their best soldier was now dead. So they ran away.

52When the soldiers from Israel and Judah saw what had happened, they chased after the Philistines. They shouted their war song as they ran. They chased the Philistines all the way to Gath, and then to the gates of Ekron town. The dead bodies of the Philistine soldiers were lying everywhere on the road to Shaaraim, as far as Gath and Ekron.