1 Samuel 17:17-24; 1 Samuel 17:32-35; 1 Samuel 17:40-50

17 Jesse said to his son David, "Take for your brothers an ephah of this parched grain and these ten loaves, and carry them quickly to the camp to your brothers; 18 also take these ten cheeses to the commander of their thousand. See how your brothers fare, and bring some token from them." 19 Now Saul, and they, and all the men of Israel, were in the valley of Elah, fighting with the Philistines. 20 David rose early in the morning, left the sheep with a keeper, took the provisions, and went as Jesse had commanded him. He came to the encampment as the army was going forth to the battle line, shouting the war cry. 21 Israel and the Philistines drew up for battle, army against army. 22 David left the things in charge of the keeper of the baggage, ran to the ranks, and went and greeted his brothers. 23 As he talked with them, the champion, the Philistine of Gath, Goliath by name, came up out of the ranks of the Philistines, and spoke the same words as before. And David heard him. 24 All the Israelites, when they saw the man, fled from him and were very much afraid.
32 David said to Saul, "Let no one's heart fail because of him; your servant will go and fight with this Philistine." 33 Saul said to David, "You are not able to go against this Philistine to fight with him; for you are just a boy, and he has been a warrior from his youth." 34 But David said to Saul, "Your servant used to keep sheep for his father; and whenever a lion or a bear came, and took a lamb from the flock, 35 I went after it and struck it down, rescuing the lamb from its mouth; and if it turned against me, I would catch it by the jaw, strike it down, and kill it.
40 Then he took his staff in his hand, and chose five smooth stones from the wadi, and put them in his shepherd's bag, in the pouch; his sling was in his hand, and he drew near to the Philistine. 41 The Philistine came on and drew near to David, with his shield-bearer in front of him. 42 When the Philistine looked and saw David, he disdained him, for he was only a youth, ruddy and handsome in appearance. 43 The Philistine said to David, "Am I a dog, that you come to me with sticks?" And the Philistine cursed David by his gods. 44 The Philistine said to David, "Come to me, and I will give your flesh to the birds of the air and to the wild animals of the field." 45 But David said to the Philistine, "You come to me with sword and spear and javelin; but I come to you in the name of the Lord of hosts, the God of the armies of Israel, whom you have defied. 46 This very day the Lord will deliver you into my hand, and I will strike you down and cut off your head; and I will give the dead bodies of the Philistine army this very day to the birds of the air and to the wild animals of the earth, so that all the earth may know that there is a God in Israel, 47 and that all this assembly may know that the Lord does not save by sword and spear; for the battle is the Lord's and he will give you into our hand." 48 When the Philistine drew nearer to meet David, David ran quickly toward the battle line to meet the Philistine. 49 David put his hand in his bag, took out a stone, slung it, and struck the Philistine on his forehead; the stone sank into his forehead, and he fell face down on the ground. 50 So David prevailed over the Philistine with a sling and a stone, striking down the Philistine and killing him; there was no sword in David's hand.