President Joseph Fielding Smith (1876–1972) discussed Mosiah’s use of the interpreters in translating the Jaredite record:
“The people of Limhi brought to Mosiah a record, ‘… engraven on plates of ore,’ [Mosiah 21:27] which record Mosiah translated by the aid of ‘two stones which were fastened into the two rims of a bow.’ …
“Joseph Smith received with the ‘breastplate’ and the plates of the Book of Mormon, the Urim and Thummim, which were hid up by Moroni to come forth in the last days as a means by which the ancient record might be translated, which Urim and Thummim were given to the brother of Jared [see D&C 17:1]” (Answers to Gospel Questions, comp. Joseph Fielding Smith Jr., 5 vols. [1957–66], 1:161–62).