Quran 4:48 from Surah An-Nisaa on Divine Marvels.
إِنَّ ٱللَّهَ لَا يَغۡفِرُ أَن يُشۡرَكَ بِهِۦ وَيَغۡفِرُ مَا دُونَ ذَٰلِكَ لِمَن يَشَآءُۚ وَمَن يُشۡرِكۡ بِٱللَّهِ فَقَدِ ٱفۡتَرَىٰٓ إِثۡمًا عَظِيمًا
English translation: Indeed Allah (does) not forgive that partners be associated with Him but He forgives from other than that for whom He wills And whoever associates partners with Allah then surely he has fabricated a sin tremendous
Transliteration: inna al-laha la yaghfiru an yush'raka bihi wayaghfiru ma duna dhalika liman yashau waman yush'rik bil-lahi faqadi if'tara ith'man aziman