Verse 167

وَإِذْ تَأَذَّنَ رَبُّكَ لَيَبْعَثَنَّ عَلَيْهِمْ إِلَىٰ يَوْمِ ٱلْقِيَـٰمَةِ مَن يَسُومُهُمْ سُوٓءَ ٱلْعَذَابِ إِنَّ رَبَّكَ لَسَرِيعُ ٱلْعِقَابِ وَإِنَّهُۥ لَغَفُورٌ رَّحِيمٌ

And when your Lord wills, He will surely raise those against them who inflict the worst punishment upon them until the Day of Resurrection; for indeed your Lord is quick in exacting retribution and indeed He is most assuredly All Forgiving, All Merciful.