1 Samuel 17:50

46 This day the LORD will deliver you into my hand. This day I will strike you down, cut off your head, and give the carcasses of the Philistines to the birds of the air and the creatures of the earth. Then the whole world will know that there is a God in Israel.

47 And all those assembled here will know that it is not by sword or spear that the LORD saves; for the battle is the LORD’s, and He will give all of you into our hands.”

48 As the Philistine started forward to attack him, David ran quickly toward the battle line to meet him.

49 Then David reached into his bag, took out a stone, and slung it, striking the Philistine on the forehead. The stone sank into his forehead, and he fell facedown on the ground.

50 Thus David prevailed over the Philistine with a sling and a stone; without a sword in his hand he struck down the Philistine and killed him.

51 David ran and stood over him. He grabbed the Philistine’s sword and pulled it from its sheath and killed him; and he cut off his head with the sword. When the Philistines saw that their hero was dead, they turned and ran.

52 Then the men of Israel and Judah charged forward with a shout and pursued the Philistines to the entrance of Gath and to the gates of Ekron. And the bodies of the Philistines were strewn along the Shaaraim road to Gath and Ekron.

53 When the Israelites returned from their pursuit of the Philistines, they plundered their camps.

54 David took the head of the Philistine and brought it to Jerusalem, and he put Goliath’s weapons in his own tent.

Read all of 1 Samuel 17