In 2 Nephi 29:12-13, Nephi recites the words of the God of the house of Israel, who also covenanted with Abraham that he would remember his seed forever:
For behold, I shall speak unto the Jews and they shall write it; and I shall also speak unto the Nephites and they shall write it; and I shall also speak unto the other tribes of the house of Israel, which I have led away, and they shall write it; and I shall also speak unto all nations of the earth and they shall write it. And it shall come to pass that the Jews shall have the words of the Nephites, and the Nephites shall have the words of the Jews; and the Nephites and the Jews shall have the words of the lost tribes of Israel; and the lost tribes of Israel shall have the words of the Nephites and the Jews.
Concerning these events relative to the lost tribes of Israel, Bruce R. McConkie writes:
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) [Bruce R. McConkie, Gospel Doctrine, p. 458] [See the commentary on 1 Nephi 22:4; 3 Nephi 16:1]