So David prevailed over the Philistine with a sling and with a stone, and smote the Philistine, and slew him; but there was no sword in the hand of David.(1 Samuel 17:50)

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.(1 Samuel 17:51)

And the men of Israel and of Judah arose, and shouted, and pursued the Philistines, until thou come to the valley, and to the gates of Ekron. And the wounded of the Philistines fell down by the way to Shaaraim, even unto Gath, and unto Ekron.(1 Samuel 17:52)

And David took the head of the Philistine, and brought it to Jerusalem; but he put his armor in his tent.(1 Samuel 17:54)

And when Saul saw David go forth against the Philistine, he said unto Abner, the captain of the host, Abner, whose son is this youth? And Abner said, As thy soul liveth, O king, I cannot tell.(1 Samuel 17:55)

And the king said, Inquire thou whose son the stripling is.(1 Samuel 17:56)