Joseph recorded a revelation that promised Oliver Cowdery the ability to translate if he was faithful.
Book of Commandments (Independence, MO: W.W. Phelps, 1833): 19, The Joseph Smith Papers website, accessed August 11, 2021
O remember, these words and keep my commandments. Remember this is your gift. Now this is not all, for you have another gift, which is the gift of working with the rod: behold it has told you things: behold there is no other power save God, that can cause this rod of nature, to work in your hands, for it is the work of God; and therefore whatsoever you shall ask me to tell you by that means, that will I grant unto you, that you shall know.