For all who will have a blessing at my hands shall abide the law which was appointed for that blessing, and the conditions thereof, as were instituted from before the foundation of the world.
And everything that is in the world, whether it be ordained of men, by thrones, or principalities, or powers, or things of name, whatsoever they may be, that are not by me or by my word, saith the Lord, shall be thrown down, and shall not remain after men are dead, neither in nor after the resurrection, saith the Lord your God.
For whatsoever things remain are by me; and whatsoever things are not by me shall be shaken and destroyed.
Therefore, if a man marry him a [spouse] in the world, and he marry [the spouse] not by me nor by my word, and he covenant with [the spouse] so long as he is in the world and [the spouse] with him, their covenant and marriage are not of force when they are dead, and when they are out of the world; therefore, they are not bound by any law when they are out of the world.
Broad is the gate, and wide the way that leadeth to the deaths; and many there are that go in thereat, because they receive me not, neither do they abide in my law.
D&C 132:5, 13-15, 25 (1843).