Surah Al-Araf Verse 167 - English Translation by Tbirving
Surah Al-Arafوَإِذۡ تَأَذَّنَ رَبُّكَ لَيَبۡعَثَنَّ عَلَيۡهِمۡ إِلَىٰ يَوۡمِ ٱلۡقِيَٰمَةِ مَن يَسُومُهُمۡ سُوٓءَ ٱلۡعَذَابِۗ إِنَّ رَبَّكَ لَسَرِيعُ ٱلۡعِقَابِ وَإِنَّهُۥ لَغَفُورٞ رَّحِيمٞ
So your Lord announced that He would send someone against them who would impose the worst torment on them until Resurrection Day. Your Lord is Prompt with punishment, while He is (also) Forgiving, Merciful