1st Samuel 17:30

27 And the people answered him after this manner, saying, So shall it be done to the man that killeth him.

28 And Eliab his eldest brother heard when he spake unto the men; and Eliab's anger was kindled against David, and he said, Why camest thou down hither? and with whom hast thou left those few sheep in the wilderness? I know thy pride, and the naughtiness of thine heart; for thou art come down that thou mightest see the battle.

29 And David said, What have I now done? Is there not a cause?

30 And he turned from him toward another, and spake after the same manner: and the people answered him again after the former manner.

31 And when the words were heard which David spake, they rehearsed them before Saul: and he sent for him.

32 And David said to Saul, Let no man's heart fail because of him; thy servant will go and fight with this Philistine.

33 And Saul said to David, Thou art not able to go against this Philistine to fight with him: for thou art but a youth, and he a man of war from his youth.