'White' in the Bible

I saw by night, and behold a man riding upon a red horse, and he stood among the myrtle trees that were in the bottom; and behind him were there red horses, speckled, and white.

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

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.