1 Samuel 17:51 in the King James Version
Therefore David ran, and stood upon the Philistine, and took his sword, and drew it out of the sheath thereof, and slew him, and cut off his head therewith. And when the Philistines saw their champion was dead, they fled.
Context
50 So David prevailed over the Philistine with a sling and with a stone, and struck the Philistine and killed him; but there was no sword in David’s hand.
51 Then David ran, stood over the Philistine, took his sword, drew it out of its sheath, killed him, and cut off his head with it. When the Philistines saw that their champion was dead, they fled.
52 The men of Israel and of Judah arose and shouted, and pursued the Philistines as far as Gai and to the gates of Ekron. The wounded of the Philistines fell down by the way to Shaaraim, even to Gath and to Ekron.