in view of the coming blessing, the prophet bursts forth in exultation, yet with a vein of prophecy running through all the canticle. After the late denunciation of woe and judgment, he soothes the faithful with the promise of the grace and peace which the time of Messiah shall bring.
Sing, O daughter of Zion (Isaiah 1:8; Zechariah 2:1-13:14; Zechariah 9:9). He calls on the restored remnant of Judah to show its joy by outward tokens. O Israel. All the tribes are to unite in praising God.
This is one of the passages where "Israel" is supposed to have been written by mistake for "Jerusalem." So Jeremiah 23:6. The LXX. gives, θύγατερ ἱερουσαλήμ, "daughter of Jerusalem" (see note on Zechariah 1:19).
The prophet enjoins a triple note of exultation in order to confirm the universal joy.