1 Samuel 17:20-25

So David got up early in the morning, left the flock with a keeper, picked up the provisions and went just as Jesse had directed him. And he came to the encampment as the army was going out in battle formation shouting the battle cry. Israel and the Philistines drew up in battle formation, army against army. Then David left his provisions in the care of the supply keeper, and ran to the ranks and came and greeted his brothers. As he was talking with them, behold, the champion, the Philistine of Gath named Goliath, was coming up from the army of the Philistines, and he spoke these same words again; and David heard him. When the men of Israel all saw the man, they fled from him, and were very frightened. The men of Israel said, “Have you seen this man who is coming up? Surely he is coming up to defy Israel. The king will reward the man who kills him with great riches, and will give him his daughter [in marriage] and make his father’s house (family) free [from taxes and service] in Israel.”