1 Samuel 17:51-52

51And David ran, and stood upon the Philistine, and took his sword, and drew it out of its sheath, and killed him completely, and cut off his head with it. And when the Philistines saw that their hero was dead, they fled.

52And the men of Israel and of Judah arose, and shouted, and pursued the Philistines, until thou comest to the ravine and to the gates of Ekron. And the wounded of the Philistines fell down on the way to Shaaraim, even to Gath, and to Ekron.