1 Samuel 17:51

Overview - 1 Samuel 17
1	The armies of the Israelites and Philistines being ready to battle,
4	Goliath challenges a combat.
12	David, sent by his father to visit his brethren, takes the challenge.
28	Eliab chides him.
30	He is brought to Saul;
32	shews the reason of his confidence;
38	and slays the giant.
55	Saul takes notice of David.

1 Samuel 17:51  (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.