I suppose that this work of restoration among all nations, kindreds, tongues, and people, of which the coming forth of the Book of Mormon was the beginning, embraces activity on both sides of the veil, for the salvation of the race. St. Paul, certainly, had such an application in view, when he wrote to the Saints in Ephesus “That in the dispensation of the fulness of times”—and that is the times of which Nephi speaks—“he might gather together in one all things in Christ, both which are in heaven and which are on earth; even in him.” (Eph. 1:10)
Work for the Dead. But, is there any evidence that the descendants of Lehi at this time knew of work for those on the other side of the veil?
Perhaps not!
And yet, they were temple builders. And they must have had some temple service.
Alma, speaking of the resurrection of the dead to Zeezrom, said, in part:
“It is given unto many to know the mysteries of God; nevertheless they are laid under a strict command that they shall not impart only according to the portion of his word which he doth grant unto the children of men, according to the heed and diligence which they give unto him. And therefore, he that will harden his heart, the same receiveth the lesser portion of the word; and he that will not harden his heart, to him is given the greater portion of the word, until it is given him to know the mysteries of God, until he know them in full.” (Alma 12:9-11)