1 Samuel 17:37-39 Modern English Version (MEV)
37 David said, “The Lord who 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 to David, “Go, and the Lord be with you.”
38 Saul clothed David with his armor. And he put a helmet of bronze on his head. He also clothed him with a coat of mail. 39 David secured his sword to his armor and tried to walk, but he was not used to it, 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.