Al A’raf Ayah 167

وَإِذْ تَأَذَّنَ رَبُّكَ لَيَبْعَثَنَّ عَلَيْهِمْ إِلَىٰ يَوْمِ ٱلْقِيَـٰمَةِ مَن يَسُومُهُمْ سُوٓءَ ٱلْعَذَابِ‌ۗ إِنَّ رَبَّكَ لَسَرِيعُ ٱلْعِقَابِ‌ۖ وَإِنَّهُۥ لَغَفُورٌ رَّحِيمٌ ١٦٧ And ?remember, O Prophet,? when your Lord declared that He would send against them others who would make them suffer terribly until the Day of Judgment. Indeed, your Lord is swift in punishment, but He is certainly All-Forgiving, Most Merciful.