Elder Neal A. Maxwell testified that other records yet to come forth will testify of Jesus Christ: “Lost books are among the treasures yet to come forth. Over twenty of these are mentioned in the existing scriptures. Perhaps most startling and voluminous will be the records of the lost tribes of Israel (see 2 Nephi 29:13). We would not even know of the impending third witness for Christ except through the precious Book of Mormon, the second witness for Christ! This third set of sacred records will thus complete a triad of truth. Then, just as the Perfect Shepherd has said, ‘My word also shall be gathered in one’ (verse 14). There will be ‘one fold and one shepherd’ (1 Nephi 22:25) in a welding together of all the Christian dispensations of human history (see D&C 128:18)” (in Conference Report, Oct. 1986, 70; or Ensign, Nov. 1986, 52).
The coming together of sacred records is a major theme of the Book of Mormon. This concept is taught in 2 Nephi 29:12–13. Later examples in the Book of Mormon include King Limhi and Ammon returning with the Jaredite record (see Mosiah 22:14; 28:12, 14), King Limhi and Ammon returning with their own records (see Mosiah 7:1–2, 17–33; 8:1, 3–4), and Alma’s colony returning with their records (see Mosiah 25:1–6).