We frequently hear that when the ten tribes return they will bring their scriptures with them. This idea, though not found specifically in scripture, is generally inferred from Nephi’s prophecy:
“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” (2 Nephi 29:13).
“Will they not bring their scriptures with them?” Elder McConkie asked. “Probably not at least there is no such promise. Yes, we and they will have their scriptures; and those scriptures will tell of the visit of the Risen Lord among their forebears. How they shall be brought to light is not known. It may be in much the same way the Book of Mormon was revealed to the world. And once again it will he by or under the direction of the President of the Church, for he holds the keys of the mysteries of the kingdom and of the things that are sealed and hidden up.” (New Witness, p. 521.)