Surah Al-A'raf (The Heights), Verse 167

وَاِذْ تَاَذَّنَ رَبُّكَ لَیَبْعَثَنَّ عَلَیْهِمْ اِلٰی یَوْمِ الْقِیٰمَةِ مَنْ یَّسُوْمُهُمْ سُوْٓءَ الْعَذَابِ اِنَّ رَبَّكَ لَسَرِیْعُ الْعِقَابِ وَاِنَّهٗ لَغَفُوْرٌ رَّحِیْمٌ ۟

Wa iz ta azzana Rabbuka la yab'asannna 'alaihim ilaa Yawmil Qiyaamati mai yasoomuhum sooo'al 'azaab; inna Rabbaka lasaree'ul 'iqaabi wa innahoo la Ghafoorur Raheem

“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.”

Quran 7:167 (Yusuf Ali Translation)