The Book of Mormon: Chapter Fifty: Ether 13:1–12
1And now I, Moroni, proceed to finish my record concerning the destruction of the people of whom I have been writing. 2For behold, they rejected all the words of Ether; for he truly told them of all things, from the beginning of man; and that after the waters had receded from off the face of this land it became a choice land above all other lands, a chosen land of the Lord; wherefore the Lord would have that all men should serve him who dwell upon the face thereof;
3And that it was the place of the aNew Jerusalem, which should come down out of heaven, and the holy sanctuary of the Lord.
After the close of the millennial reign we are informed that Satan, who was bound during the millennium, shall be loosed and go forth to deceive the nations. Then will come the end. The earth will die and be purified and receive its resurrection. During this cleansing period the City Zion, or New Jerusalem, will be taken from the earth; and when the earth is prepared for the celestial glory, the city will come down according to the prediction in the Book of Revelation” (Joseph F. Smith, Answers to Gospel Questions, 2:103–6).