1 Samuel 17:51-52

51David ran and stood over him. He grabbed the Philistine’s sword, pulled it from its sheath, and used it to kill him. Then he cut off his head. When the Philistines saw that their hero was dead, they fled.

52The men of Israel and Judah rallied, shouting their battle cry, and chased the Philistines to the entrance of the valley and to the gates of Ekron. Philistine bodies were strewn all along the Shaaraim road to Gath and Ekron.