When they are out of the world they neither marry nor are given in marriage; but are appointed angels in heaven, which angels are ministering servants, to minister for those who are worthy of a far more, and an exceeding, and an eternal weight of glory. Doctrine & Covenants 132:16
Trivia: Who was filled with ther Holy Ghost in his mother's womb, was ordained by an angel when he was eight years old, and baptized when he was a child?