“Not Lost Unto the Father”

Church Educational System
Although the scattered tribes of Israel are lost to the knowledge of man, they are not lost to God. He knows where they are, “for he knoweth whither he hath taken them” (3 Nephi 17:4). The fact that the Savior would visit them is interesting in that it suggests there will someday be available a third account of Jesus’ visits to his people.

Earlier in the Book of Mormon (2 Nephi 29:11–14), the Lord promises that in the mouths of three great scriptural witnesses the divinity of Christ would be established. It is of interest to note that evidently the resurrected Jesus Christ appeared to all of the peoples who were to write these great scriptural witnesses. He appeared as a resurrected being to the Jews, from whom we get the Bible; he appeared as a resurrected being to the Nephites, from whom we get the Book of Mormon; and he promises here that he is going to appear as a resurrected being to the lost tribes of Israel, from whom shall come the third great scriptural witness.

(Daniel H. Ludlow, A Companion to Your Study of the Book of Mormon, p. 271)

Book of Mormon Student Manual (1996 Edition)