"Zion is both a place and a people. Zion was the name given to the ancient city of Enoch in the days before the Flood. 'And it came to pass in his days, that he built a city that was called the City of Holiness, even Zion' (Moses 7:19). This Zion endured for some 365 years (see Moses 7:68). The scriptural record states, 'And Enoch and all his people walked with God, and he dwelt in the midst of Zion; and it came to pass that Zion was not, for God received it up into his own bosom; and from thence went forth the saying, Zion is fled' (Moses 7:69). . . .
"The Lord called Enoch's people Zion 'because they were of one heart and one mind, and dwelt in righteousness; and there was no poor among them' (Moses 7:18). Elsewhere He said, 'For this is Zion—the pure in heart' (D&C 97:21)."
D. Todd Christofferson, "Come to Zion," Ensign, Nov. 2008, 37