Surah Az-Zukhruf 43:66

هَلْ يَنظُرُونَ إِلَّا ٱلسَّاعَةَ أَن تَأْتِيَهُم بَغْتَةً وَهُمْ لَا يَشْعُرُونَ

Are they waiting except for the Hour to come upon them suddenly while they perceive not?

Translation: Saheeh International

Tafsir

Are they that is the Meccan disbelievers awaiting anything that is to say — they are in fact awaiting nothing — but that Hour should come upon them an ta’tiyahum substitutes for al-sā‘ata ‘the Hour’ suddenly unexpectedly while they are unaware? of the time of its coming beforehand.

Excerpt from Tafsir al-Jalalayn, commentary on 43:66, via Quran.com. The reader has the full commentary and 9 more tafsirs.