Commentaries:
Jamieson, Fausset, and Brown
Let us . . . I—manifesting zeal and love: converted themselves, they seek the conversion of others (Song of Solomon 1:4). To exhortation in general ("Let us go"), they add individual example ("I will go"). Or, the change from plural to singular implies that the general consent in religious earnestness leads each individual to decide for God.
go speedily—literally, "go, going"; implying intense earnestness.
pray—Hebrew, "entreat the face" (Zechariah 7:2); entreat His favor and grace.
Other Jamieson, Fausset, and Brown entries containing Zechariah 8:21:
Psalms 102:21
Isaiah 2:3
Isaiah 41:20
Isaiah 45:20
Zechariah 7:3
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