1 Samuel 17:36-46

36 Your servant has killed both lions and bears; and this uncircumcised Philistine shall be like one of them, seeing he has defied the armies of the living God."
37 And David said, "The LORD who delivered me from the paw of the lion and from the paw of the bear, will deliver me from the hand of this Philistine." And Saul said to David, "Go, and the LORD be with you!"
38 Then Saul clothed David with his armor; he put a helmet of bronze on his head, and clothed him with a coat of mail.
39 And David girded his sword over his armor, and he tried in vain to go, for he was not used to them. Then David said to Saul, "I cannot go with these; for I am not used to them." And David put them off.
40 Then he took his staff in his hand, and chose five smooth stones from the brook, and put them in his shepherd's bag or wallet; his sling was in his hand, and he drew near to the Philistine.
41 And the Philistine came on and drew near to David, with his shield-bearer in front of him.
42 And when the Philistine looked, and saw David, he disdained him; for he was but a youth, ruddy and comely in appearance.
43 And 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 beasts of the field."
45 Then David said to the Philistine, "You come to me with a sword and with a spear and with a 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 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 host of the Philistines this day to the birds of the air and to the wild beasts of the earth; that all the earth may know that there is a God in Israel,