1 Samuel 17:37-39 Young's Literal Translation (YLT)
37 And David saith, `Jehovah, who delivered me out of the paw of the lion, and out of the paw of the bear, He doth deliver me from the hand of this Philistine.' And Saul saith unto David, `Go, and Jehovah is with thee.'
38 And Saul clotheth David with his long robe, and hath put a helmet of brass on his head, and doth clothe him with a coat of mail.
39 And David girded his sword above his long robe, and beginneth to go, for he hath not tried [it]; and David saith unto Saul, `I am not able to go with these, for I had not tried;' and David turneth them aside from off him.