1 Samuel 17:37-39 American Standard Version (ASV)
37 And David said, Jehovah 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 Jehovah shall be with thee. 38 And Saul clad David with his apparel, and he put a helmet of brass upon his head, and he clad him with a coat of mail. 39 And David girded his sword upon his apparel, 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.