Quran 8:25 from Surah Al-Anfaal on Divine Marvels.
وَٱتَّقُواْ فِتۡنَةٗ لَّا تُصِيبَنَّ ٱلَّذِينَ ظَلَمُواْ مِنكُمۡ خَآصَّةٗۖ وَٱعۡلَمُوٓاْ أَنَّ ٱللَّهَ شَدِيدُ ٱلۡعِقَابِ
English translation: And fear a trial not which will afflict those who do wrong among you exclusively And know that Allah (is) severe (in) the penalty
Transliteration: wa-ittaqu fit'natan la tusibanna alladhina zalamu minkum khassatan wa-i'lamu anna al-laha shadidu al-'iqabi