בַּמֶּרְכָּבָ֥ה הָרִֽאשֹׁנָ֖ה סוּסִ֣ים אֲדֻמִּ֑ים וּבַמֶּרְכָּבָ֥ה הַשֵּׁנִ֖ית סוּסִ֥ים שְׁחֹרִֽים׃
אין ערשטן רײַטװאָגן רױטע פֿערד, און אין צװײטן רײַטװאָגן שװאַרצע פֿערד,
Rashi
red horses They were the ones that caused Babylon to mount, for [Babylon] is red, as it is written (Dan. 2:38): “You are the head of gold” [gold having a red tinge].
Rashi
black [Horses,] to cause Media to mount, for they blackened the faces of Israel in the days of Haman.