1 Samuel 17:37-39 Authorized (King James) Version (AKJV)
37 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.
38 And Saul armed David with his armour, and he put an helmet of brass upon his head; also he armed him with a coat of mail. 39 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.