الاعراف — Al-A'raf Ayat 167
وَاِذْ تَاَذَّنَ رَبُّكَ لَيَبْعَثَنَّ عَلَيْهِمْ اِلٰى يَوْمِ الْقِيٰمَةِ مَنْ يَّسُوْمُهُمْ سُوْۤءَ الْعَذَابِۗ اِنَّ رَبَّكَ لَسَرِيْعُ الْعِقَابِۖ وَاِنَّهٗ لَغَفُوْرٌ رَّحِيْمٌ
Wa iż ta'ażżana rabbuka layab‘aṡanna ‘alaihim ilā yaumil-qiyāmati may yasūmuhum sū'al-‘ażāb(i), inna rabbaka lasarī‘ul-‘iqāb(i), wa innahū lagafūrur raḥīm(un).
"And [mention] when your Lord declared that He would surely [continue to] send upon them until the Day of Resurrection those who would afflict them with the worst torment. Indeed, your Lord is swift in penalty; but indeed, He is Forgiving and Merciful."