Quran 41:27 from Surah Fussilat on Divine Marvels.
فَلَنُذِيقَنَّ ٱلَّذِينَ كَفَرُواْ عَذَابٗا شَدِيدٗا وَلَنَجۡزِيَنَّهُمۡ أَسۡوَأَ ٱلَّذِي كَانُواْ يَعۡمَلُونَ
English translation: But surely We will cause to taste those who disbelieve a punishment severe and surely We will recompense them (the) worst (of) what they used (to) do
Transliteration: falanudhiqanna alladhina kafaru adhaban shadidan walanajziyannahum aswa-a alladhi kanu ya'maluna