﴿ إِنَّ ٱللَّهَ لَا يَغْفِرُ أَن يُشْرَكَ بِهِۦ وَيَغْفِرُ مَا دُونَ ذَٰلِكَ لِمَن يَشَآءُ ۚ وَمَن يُشْرِكْ بِٱللَّهِ فَقَدِ ٱفْتَرَىٰٓ إِثْمًا عَظِيمًا ﴾

“VERILY, God does not forgive the ascribing of divinity to aught beside Him, although He forgives any lesser sin unto whomever He wills: for he who ascribes divinity to aught beside God has indeed contrived an awesome sin.”

(Lo! Allah forgiveth not that a partner should be ascribed unto Him) if one dies in such a state. He forgiveth (all) save that to whom He will) to whomever repents. (Whoso ascribeth partners to Allah, he hath indeed invented a tremendous sin) a tremendous lie. This verse was revealed about Wahshiyy, the murderer of Hamzah, the uncle of the Prophet (pbuh).