وَإِذْ تَأَذَّنَ رَبُّكَ لَيَبْعَثَنَّ عَلَيْهِمْ إِلَىٰ يَوْمِ ٱلْقِيَـٰمَةِ مَن يَسُومُهُمْ سُوٓءَ ٱلْعَذَابِ ۗ إِنَّ رَبَّكَ لَسَرِيعُ ٱلْعِقَابِ ۖ وَإِنَّهُۥ لَغَفُورٌ رَّحِيمٌ
Wa iz ta azzana Rabbuka la yab'asannna 'alaihim ilaa Yawmil Qiyaamati mai yasoomuhum sooo'al 'azaab; inna Rabbaka lasaree'ul 'iqaab; wa innahoo la Ghafoorur Raheem
And your Lord declared that he would send against them, until the day of resurrection, those who would inflict on them the worst of torments. Indeed, your Lord is swift in retribution, and indeed, he is forgiving, merciful.