Zechariah 6:3

6:3 to the third white horses, and to the fourth spotted horses, all of them strong. ¹ 

Zechariah 6:6

6:6 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.

[6:3]  ¹ tc For the MT reading אֲמֻצִּים (’amutsim, “strong”) Aquila and Syriac presuppose אֲדֻמִּים (’adummim, “red”), thus giving the red horse an assignment and eliminating the problem of a fifth, “spotted” horse. The fourth would be a mottled red horse according to this view. There is, however, no manuscript support for this interpretation.