The Lord revealed to Joseph Smith that He would reveal all aspects of the Nauvoo temple and its priesthood, including the restoration of the "fulness of the priesthood," an ordinance conferring the status of kings and priests or queens and priestesses for exaltation.
Section 124:28, Doctrine and Covenants, The Church of Jesus Christ of Latter-day Saints, accessed May 23, 2023
28 For there is not a place found on earth that he may come to and restore again that which was lost unto you, or which he hath taken away, even the fulness of the priesthood.