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.
NASB: Then Saul said to David, "You are not able to go against this Philistine to fight with him; for you are but a youth while he has been a warrior from his youth."
KJV: David said moreover, The LORD that delivered me out of the paw of the lion, and out of the paw of the bear, he will deliver me out of the hand of this Philistine. And Saul said unto David, Go, and the LORD be with thee.
NASB: And David said, "The LORD who delivered me from the paw of the lion and from the paw of the bear, He will deliver me from the hand of this Philistine." And Saul said to David, "Go, and may the LORD be with you."
KJV: And David girded his sword upon his armour, and he assayed to go; for he had not proved it. And David said unto Saul, I cannot go with these; for I have not proved them. And David put them off him.
NASB: David girded his sword over his armor and tried to walk, for he had not tested them. So David said to Saul, "I cannot go with these, for I have not tested them." And David took them off.