Zechariah 14:6 Midrash

וְהָיָ֖ה בַּיּ֣וֹם הַה֑וּא לֹֽא־יִהְיֶ֣ה א֔וֹר יְקָר֖וֹת יקפאון [וְקִפָּאֽוֹן׃]

And it shall come to pass in that day, that there shall not be light, But heavy clouds and thick;