FairMormon is a non-profit organization dedicated to providing well-documented answers to criticisms of LDS doctrine, belief and practice.
Source:Joseph Fielding Smith:Conference Report:1951:Jesus says unto those who are married for time only, and those who do not believe in marriage for eternity
Joseph Fielding Smith (1951): Jesus "says unto those who are married for time only, and those who do not believe in marriage for eternity"
Joseph Fielding Smith:
I call your attention to the fact that the Lord said that he and his disciples did not belong to this world; the Sadducees did. To continue: "But they which shall be counted worthy to attain that world and the resurrection from the dead, neither marry nor are given in marriage." ( See Matt. 22: 23-30. ) This is absolutely true.
And the Lord has revealed this same doctrine to the Church in the day in which we live. He says unto those who are married for time only, and those who do not believe in marriage for eternity:
Therefore, 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.
For these angels did not abide my law; therefore, they cannot be enlarged, but remain separately and singly, without exaltation, in their saved condition, to all eternity, and from henceforth are not gods, but are angels of God forever and ever. (D. & C. 132:16-17.)
So the Lord says those of that class, who may be worthy to enter the kingdom of heaven, shall be like the angels, and they remain separately and singly in eternity. 
- Conference Report (October 1951), 119.