1st Samuel 17:10

7 and the wood of his spear [is] like a beam of weavers`, and the flame of his spear [is] six hundred shekels of iron, and the bearer of the buckler is going before him.

8 And he standeth and calleth unto the ranks of Israel, and saith to them, `Why are ye come out to set in array the battle? [am] not I the Philistine, and ye servants to Saul? choose for you a man, and let him come down unto me;

9 if he be able to fight with me, and have smitten me, then we have been to you for servants; and if I am able for him, and have smitten him, then ye have been to us for servants, and have served us.`

10 And the Philistine saith, `I have reproached the ranks of Israel this day; give to me a man, and we fight together.`

11 And Saul heareth -- and all Israel -- these words of the Philistine, and they are broken down and greatly afraid.

12 And David [is] son of this Ephrathite of Beth-Lehem-Judah, whose name [is] Jesse, and he hath eight sons, and the man in the days of Saul hath become aged among men;

13 and the three eldest sons of Jesse go, they have gone after Saul to battle; and the name of his three sons who have gone into battle [are] Eliab the first-born, and his second Abinadab, and the third Shammah.