וּבַמֶּרְכָּבָ֥ה הַשְּׁלִשִׁ֖ית סוּסִ֣ים לְבָנִ֑ים וּבַמֶּרְכָּבָה֙ הָרְבִעִ֔ית סוּסִ֥ים בְּרֻדִּ֖ים אֲמֻצִּֽים׃
and in the third chariot white horses; and in the fourth chariot grizzled bay horses.
Rashi on Zechariah
white To cause Persia to mount, and Persia built the Temple.
Rashi on Zechariah
spotted They are spotted. [Their function is] to cause Greece to mount, [as Greece] oppressed Israel with various kinds of decrees
Rashi on Zechariah
ash- colored to cause Edom and Ishmael to mount, but I do not know the expression אֲמֻצִּים. Jonathan rendered: ash-colored.