And the people answered him after this manner, saying, So shall it be done to the man that killeth him.(1 Samuel 17:27)

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.(1 Samuel 17:28)

And David said, What have I now done? Is there not a cause?(1 Samuel 17:29)

And when the words were heard which David spake, they rehearsed them before Saul: and he sent for him.(1 Samuel 17:31)

And David said to Saul, Let no man's heart fail because of him; thy servant will go and fight with this Philistine.(1 Samuel 17:32)

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.(1 Samuel 17:33)