1 Samuel 17:50-54

50So David triumphed over the Philistine with a sling and a stone; without a sword in his hand he struck down the Philistine and killed him. 51David ran and stood over him. He took hold of the Philistine’s sword and drew it from the sheath. After he killed him, he cut off his head with the sword. When the Philistines saw that their hero was dead, they turned and ran. 52Then the men of Israel and Judah surged forward with a shout and pursued the Philistines to the entrance of Gath and to the gates of Ekron. Their dead were strewn along the Shaaraim road to Gath and Ekron. 53When the Israelites returned from chasing the Philistines, they plundered their camp. 54David took the Philistine’s head and brought it to Jerusalem; he put the Philistine’s weapons in his own tent.