This verse seems to be a veiled reference to the righteous Nephites’ entering into and enjoying the blessings and consummate privileges of the new and everlasting covenant of marriage. While this is not explicitly stated, it seems only reasonable to conclude that the Savior had delivered the fulness of the keys of the Holy Priesthood to this righteous and favored people; that he had seen to it that the powers to bind on earth and seal in heaven were made available to this remnant of Jacob; that he had made them partakers of “the promises made to the fathers,” those supernal promises made to Abraham, Isaac, and Jacob—the promises of the gospel, the priesthood, and of eternal life, promises received only in holy temples (see D&C 2; D&C 110; Abraham 2:8-11).
For a detailed statement on this matter, see commentary on 3 Nephi 25:5-6.