'White' in the Bible

I was attentive that night and saw a man seated on a red horse that stood among some myrtle trees in the ravine. Behind him were red, sorrel, and white horses.

to the third white horses, and to the fourth spotted horses, all of them strong.

The chariot with the black horses is going to the north country and the white ones are going after them, but the spotted ones are going to the south country.