Zechariah 8:3

Yahweh announced that He would return to Zion and reside among His people in Jerusalem again (cf. Zechariah 1:16; Zechariah 2:10). When He did, people would call Jerusalem the City of Truth, and they would refer to the temple mount as the Holy Mountain (cf. Zechariah 14:20-21). Finally the recurring cycle of apostasy followed by punishment would end.

"Jerusalem did not acquire this character in the period after the captivity, in which, though not defiled by gross idolatry, as in the times before the captivity, it was polluted by other moral abominations no less than it had been before. Jerusalem becomes a faithful city for the first time through the Messiah, and it is through Him that the temple mountain first really becomes the holy mountain." [Note: Keil, 2:312.]