وَاِذْ تَاَذَّنَ رَبُّكَ لَيَبْعَثَنَّ عَلَيْهِمْ اِلٰي يَوْمِ الْقِيٰمَةِ مَنْ يَّسُوْمُهُمْ سُوْ࢜ءَ الْعَذَابِؕ اِنَّ رَبَّكَ لَسَرِيْعُ الْعِقَابِۚۖ وَاِنَّهٗ لَغَفُوْرٌ رَّحِيْمٌ ١٦٧
Translation
And when your Lord proclaimed that He would surely send against them, until the Day of Resurrection, those who would inflict on them a terrible punishment. Indeed your Lord is swift in retribution, and indeed, He is all-forgiving, all-merciful.