1 Samuel 17:5-15

He had a bronze helmet on his head, and wore a coat of scale-armor (overlapping metal plates) which weighed 5,000 shekels of bronze. He had bronze shin protectors on his legs and a bronze javelin hung between his shoulders. The [wooden] shaft of his spear was like a weaver’s beam; the blade-head of his spear weighed six hundred shekels of iron. And a shield-bearer walked in front of him. Goliath stood and shouted to the battle lines of Israel, saying to them, “Why have you come out to draw up for battle? Am I not the Philistine and are you not servants of Saul? Choose a man for yourselves and have him come down to me. If he is able to fight with me and kill me, then we will become your servants; but if I prevail against him and kill him, then you shall become our servants and serve us.” Again the Philistine said, “I defy the battle lines of Israel this day; give me a man so that we may fight together.” When Saul and all Israel heard these words of the Philistine, they were dismayed and greatly afraid. Now David was the son of the Ephrathite of Bethlehem in Judah, named Jesse, who had eight sons. Jesse was old in the days of Saul, advanced in years among men. His three older sons had followed Saul into battle. The names of his three sons who went to battle were Eliab, the firstborn; next, Abinadab; and third, Shammah. David was the youngest. Now the three oldest followed Saul, but David went back and forth from Saul to tend his father’s flock at Bethlehem.