Revelation given through Joseph Smith the Prophet, at Kirtland, Ohio, September 22 and 23, 1832 (Doctrine and Covenants 84: 4-5): 1
4 Verily this is the word of the Lord, that the city New Jerusalem shall be built by the gathering of the saints, beginning at this place, even the place of the temple, which temple shall be reared in this generation.
5 For verily this generation shall not all pass away until an house shall be built unto the Lord, and a cloud shall rest upon it, which cloud shall be even the glory of the Lord, which shall fill the house.
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|1.||Doctrine and Covenants Section 84 – https://www.lds.org/scriptures/dc-testament/dc/84.112|