وَإِذْ تَأَذَّنَ رَبُّكَ لَيَبْعَثَنَّ عَلَيْهِمْ إِلَى يَوْمِ الْقِيَامَةِ مَن يَسُومُهُمْ سُوءَ الْعَذَابِ إِنَّ رَبَّكَ لَسَرِيعُ الْعِقَابِ وَإِنَّهُ لَغَفُورٌ رَّحِيمٌ
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سورة الأعراف
(7/167) And recall what time thy Lord proclaimed that he would surely raise upon them, till the Day of Resurrection, someone perpetrating upon them worst oppression. Verily thy Lord is swift in chastising, and verily He is Forgiving, Merciful.
Surah Al-A'raf