1st Samuel 17:12

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.

14 And David is the youngest, and the three eldest have gone after Saul,

15 and David is going and returning from Saul, to feed the flock of his father at Beth-Lehem.