1 Samuel 17:48–54

48 When the Philistine arose and came and drew near to meet David, David ran quickly toward the battle line to meet the Philistine. 49 And David put his hand in his bag and took out a stone and slung it and struck the Philistine on his forehead. The stone sank into his forehead, and he fell on his face to the ground.

50 So David prevailed over the Philistine with a sling and with a stone, and struck the Philistine and killed him. There was no sword in the hand of David. 51 Then David ran and stood over the Philistine rand took his sword and drew it out of its sheath and killed him and cut off his head with it. When the Philistines saw that their champion was dead, sthey fled. 52 And the men of Israel and Judah rose with a shout and pursued the Philistines as far as Gath6 and the gates of tEkron, so that the wounded Philistines fell on the way from uShaaraim as far as vGath and Ekron. 53 And the people of Israel came back from chasing the Philistines, and they plundered their camp. 54 And David took wthe head of the Philistine xand brought it to Jerusalem, but he put his armor in his tent.