And again, verily, verily, I say unto you that when the thousand years are ended, and men again begin to deny their God, then will I spare the earth but for a little season;
And the end shall come, and the heaven and the earth shall be consumed and pass away, and there shall be a new heaven and a new earth.
For all old things shall pass away, and all things shall become new, even the heaven and the earth, and all the fulness thereof, both men and beasts, the fowls of the air, and the fishes of the sea;
And not one hair, neither mote, shall be lost, for it is the workmanship of mine hand.
But, behold, verily I say unto you, before the earth shall pass away, Michael, mine archangel, shall sound his trump, and then shall all the dead awake, for their graves shall be opened, and they shall come forth—yea, even all.
And the righteous shall be gathered on my right hand unto eternal life; and the wicked on my left hand will I be ashamed to own before the Father;
Wherefore I will say unto them—Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels.
And now, behold, I say unto you, never at any time have I declared from mine own mouth that they should return, for where I am they cannot come, for they have no power.
Source: Doctrine and Covenants 29:22-29; The Book of Mormon: Another Testament of Jesus Christ