Zechariah 6:3-6

3and in the third chariot white horses; and in the fourth chariot grisled, strong horses.

4And I spoke and said unto the angel that talked with me, What are these, my lord?

5And 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.

6That in which are the black horses goeth forth into the north country; and the white go forth after them; and the grisled go forth towards the south country;