Moses 7:62 reads:
And righteousness will I send down out of heaven; and truth will I send forth out of the earth, to bear testimony of mine Only Begotten; his resurrection from the dead; yea, and also the resurrection of all men; and righteousness and truth will I cause to sweep the earth as with a flood, to gather out mine elect from the four quarters of the earth, unto a place which I shall prepare, an Holy City, that my people may gird up their loins, and be looking forth for the time of my coming; for there shall be my tabernacle, and it shall be called Zion, a New Jerusalem.
This echoes the Testament of Levi 10:4 (quoting from an otherwise unknown Enoch source) which reads:
For the house which the Lord shall choose shall be called Jerusalem, as the Book of Enoch the Righteous maintains.
Where would Joseph Smith have read about this?