Quran 43:66 from Surah Az-Zukhruf on Divine Marvels.
هَلۡ يَنظُرُونَ إِلَّا ٱلسَّاعَةَ أَن تَأۡتِيَهُم بَغۡتَةٗ وَهُمۡ لَا يَشۡعُرُونَ
English translation: Are they waiting except (for) the Hour that it should come on them suddenly while they (do) not perceive
Transliteration: hal yanzuruna illa al-sa'ata an tatiyahum baghtatan wahum la yash'uruna