Quran 44:10 from Surah Ad-Dukhaan on Divine Marvels.
فَٱرۡتَقِبۡ يَوۡمَ تَأۡتِي ٱلسَّمَآءُ بِدُخَانٖ مُّبِينٖ
English translation: Then watch (for the) Day (when) will bring the sky smoke visible
Transliteration: fa-ir'taqib yawma tati al-samau bidukhanin mubinin