Quran 3:177 from Surah Aal-i-Imraan on Divine Marvels.
إِنَّ ٱلَّذِينَ ٱشۡتَرَوُاْ ٱلۡكُفۡرَ بِٱلۡإِيمَٰنِ لَن يَضُرُّواْ ٱللَّهَ شَيۡـٔٗاۖ وَلَهُمۡ عَذَابٌ أَلِيمٞ
English translation: Indeed those who (have) purchased [the] disbelief with the faith never will they harm Allah (in) anything and for them (is) a punishment painful
Transliteration: inna alladhina ish'tarawu al-kuf'ra bil-imani lan yadurru al-laha shayan walahum adhabun alimun