Albert Barnes Commentary Zechariah 6:8

"Then cried he to me, and spake unto me, saying, Behold, they that go toward the north country have quieted my spirit in the north country." — Zechariah 6:8 (ASV)

Then God, or the Angel of the Lord - who speaks of what belonged to God alone, called me (probably “loudly”; compare Judges 4:10, Judges 4:13; 2 Samuel 20:4–5), so as to command my attention to this which most immediately concerned His people.

These have quieted My spirit in the north country - or rather, “have made My anger to rest” on them, that is, they have carried it there and deposited it, made it to rest upon them as its dwelling place, as John says of the unbelieving, The wrath of God abideth on him (John 3:36).

Babylon had been the final antagonist and subduer of the people of God. It had, at the outset, destroyed the temple of God and carried off its vessels to adorn idol-temples.

Its empire closed on that night when it triumphed over God, using the vessels dedicated to Him to glorify their idols. In that night was Belshazzar the king of the Chaldaeans slain.

This final execution of God’s anger upon their destroyer was the pledge of their rest; and in this, the visions pause.