1 Samuel 17:33

33 Saul replied, “You are not able to go out against this Philistine and fight him; you are only a young man, and he has been a warrior from his youth.”

Read 1 Samuel 17:33 Using Other Translations

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.
And Saul said to David, "You are not able to go against this Philistine to fight with him, for you are but a youth, and he has been a man of war from his youth."
“Don’t be ridiculous!” Saul replied. “There’s no way you can fight this Philistine and possibly win! You’re only a boy, and he’s been a man of war since his youth.”