Sura 44 Ad-Dukhan (The Smoke), ayah 10

1. فَارْتَقِبْ يَوْمَ تَأْتِي السَّمَاءُ بِدُخَانٍ مُبِينٍ

   Then watch for the Day when the sky will bring a visible smoke.

   44:10

Translation: Saheeh International