1 Samuel 17:26-28

17:26 David asked the men who were standing near him, “What will be done for the man who strikes down this Philistine and frees Israel from this humiliation? For who is this uncircumcised Philistine, that he defies the armies of the living God?” 17:27 The soldiers told him what had been promised, saying, “This is what will be done for the man who can strike him down.”

17:28 When David’s oldest brother Eliab heard him speaking to the men, he became angry with David and said, “Why have you come down here? To whom did you entrust those few sheep in the desert? I am familiar with your pride and deceit! You have come down here to watch the battle!”