Al-Hajj - 22:1

بِسْمِ اللهِ الرَّحْمنِ الرَّحِيمِ يَا أَيُّهَا النَّاسُ اتَّقُوا رَبَّكُمْ إِنَّ زَلْزَلَةَ السَّاعَةِ شَيْءٌ عَظِيمٌ
[22:1]
O people! guard against (the punishment from) your Lord; surely the violence of the hour is a grievous thing.
O mankind! fear your Lord! for the convulsion of the Hour (of Judgment) will be a thing terrible!
O mankind! Fear your Lord. Lo! the earthquake of the Hour (of Doom) is a tremendous thing.