4:48
إِنَّ ٱللَّهَ لَا يَغْفِرُ أَن يُشْرَكَ بِهِۦ وَيَغْفِرُ مَا دُونَ ذَٰلِكَ لِمَن يَشَآءُ ۚ وَمَن يُشْرِكْ بِٱللَّهِ فَقَدِ ٱفْتَرَىٰٓ إِثْمًا عَظِيمًا
inna l-laha lā yaghfiru an yush'raka bihi wayaghfiru mā dūna dhālika liman yashāu waman yush'rik bil-lahi faqadi if'tarā ith'man ʿaẓīman
God does not forgive the joining of partners with Him: anything less than that He forgives to whoever He will, but anyone who joins partners with God has concocted a tremendous sin.
Verily, Allâh forgives not that partners should be set up with Him (in worship), but He forgives except that (anything else) to whom He wills; and whoever sets up partners with Allâh in worship, he has indeed invented a tremendous sin.