D&C 124

Concerning temple ordinances and covenants, the Lord said -

"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."  (Doctrine and Covenants 124:28)

 "For therein are the keys of the holy priesthood ordained, that you may receive honor and glory."  (Doctrine and Covenants 124:34)

"And verily I say unto you, let this house be built unto my name, that I may reveal mine ordinances therein unto my people;
41 For I deign to reveal unto my church things which have been kept hid from before the foundation of the world, things that pertain to the dispensation of the fulness of times."  (Doctrine and Covenants 124:40–41)

Obviously, there was yet to revealed ordinances and covenants essential to exaltation.