1 Samuel 17:33 KJV
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, King James Version
In context
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.
34 And David said unto Saul, Thy servant kept his father’s sheep, and there came a lion, and a bear, and took a lamb out of the flock: