Zechariah 6:5 (KJV)

And in the third chariot white horses; and in the fourth chariot grisled and bay horses.

Then I answered and said unto the angel that talked with me, What are these, my lord?

And the angel answered and said unto me, These are the four spirits of the heavens, which go forth from standing before the Lord of all the earth.

The black horses which are therein go forth into the north country; and the white go forth after them; and the grisled go forth toward the south country.

And the bay went forth, and sought to go that they might walk to and fro through the earth: and he said, Get you hence, walk to and fro through the earth. So they walked to and fro through the earth.