The Savior reveals that His mission includes showing Himself to the lost tribes of Israel. The Father has commanded that they should hear the voice of the Son (see 3 Nephi 16:3). Commenting on the lost tribes, Elder Bruce R. McConkie has said:
The Lost Tribes are not lost unto the Lord. In their northward journeyings they were led by prophets and inspired leaders. They had their Moses and their Lehi, were guided by the spirit of revelation, kept the law of Moses, and carried with them the statutes and judgments which the Lord had given them in age past. They were still a distinct people many hundreds of years later, for the resurrected Lord visited and ministered among them following his ministry on this continent among the Nephites. (3 Nephi 16:1–4; 17:4.) Obviously he taught them in the same way and gave them the same truths which he gave his followers in Jerusalem and on the American continent; and obviously they recorded his teachings, thus creating volumes of scripture comparable to the Bible and Book of Mormon. (2 Nephi 29:12–14.)
In due course the Lost Tribes of Israel will return and come to the children of Ephraim to receive their blessings. This great gathering will take place under the direction of the President of The Church of Jesus Christ of Latter-day Saints, for he holds the keys of “the gathering of Israel from the four parts of the earth, and the leading of the ten tribes from the land of the north.” (D. & C. 110:11.) Keys are the right of presidency the power to direct; and by this power the Lost Tribes will return, with “their prophets” and their scriptures to “be crowned with glory, even in Zion, by the hands of the servants of the Lord, even the children of Ephraim.” (D. & C. 133:26–35.) (Mormon Doctrine, 2d ed. [Salt Lake City: Bookcraft, 1966], 457–458)