'White' in the Bible

I saw at night, and behold, a man was riding on a red horse, and he was standing among the myrtle trees which were in the ravine, with red, sorrel and white horses behind him.

with the third chariot white horses, and with the fourth chariot strong dappled horses.

with one of which the black horses are going forth to the north country; and the white ones go forth after them, while the dappled ones go forth to the south country.