1 Samuel 17:38-39

New King James Version

³⁸ So Saul clothed David with his ^[a]armor, and he put a bronze helmet on his head; he also clothed him with a coat of mail. ³⁹ David fastened his sword to his armor and tried to walk, for he had not tested them. And David said to Saul, “I cannot walk with these, for I have not tested them.” So David took them off.