Then I looked up again and saw four chariots coming from between two mountains. And the mountains were made of bronze.
References for Zechariah 6:1
The first chariot had red horses, the second chariot black horses,
the third chariot white horses, and the fourth chariot dappled horses-[all] strong horses.
References for Zechariah 6:3
So I inquired of the angel who was speaking with me, "What are these, my lord?"
The angel told me, "These are the four spiritsof heaven going out after presenting themselves to the Lord of the whole earth.
References for Zechariah 6:5
The one with the black horses is going to the land of the north, the white horses are going after them, but the dappled horses are going to the land of the south."
As the strong horses went out, they wanted to go patrol the earth, and the Lord said, "Go, patrol the earth." So they patrolled the earth.
Then He summoned me saying, "See, those going to the land of the north have pacified My Spirit in the northern land."