Surah An-Naba 78:40

إِنَّآ أَنذَرْنَـٰكُمْ عَذَابًا قَرِيبًا يَوْمَ يَنظُرُ ٱلْمَرْءُ مَا قَدَّمَتْ يَدَاهُ وَيَقُولُ ٱلْكَافِرُ يَـٰلَيْتَنِى كُنتُ تُرَٰبًۢا

Indeed, We have warned you of an impending punishment on the Day when a man will observe what his hands have put forth and the disbeliever will say, "Oh, I wish that I were dust!"

Translation: Saheeh International

Tafsir

Lo! We have warned you O disbelievers of Mecca of a chastisement that is near the chastisement of the impending Day of Resurrection — for anything that is impending is also near — the day yawma adverbially qualifies ‘adhāban ‘a chastisement’ by describing it when a person when every person will behold what his hands …

Excerpt from Tafsir al-Jalalayn, commentary on 78:40, via Quran.com. The reader has the full commentary and 9 more tafsirs.