Sura al-Aʿrāf 7:167

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

wa-idh taʾadhdhana rabbuka la-yabʿathanna ʿalayhim ilā yawmi l-qiyāmati man yasūmuhum suʾa l-ʿadhābi inna rabbaka la-sarīʿu l-ʿiqābi wa-innahu la-ghafūrun raḥīmun

Behold! thy Lord did declare that He would send against them, to the Day of Judgment, those who would afflict them with grievous penalty. Thy Lord is quick in retribution, but He is also Oft-forgiving, Most Merciful.