59:4
ذَٰلِكَ بِأَنَّهُمْ شَآقُّوا۟ ٱللَّهَ وَرَسُولَهُۥ ۖ وَمَن يُشَآقِّ ٱللَّهَ فَإِنَّ ٱللَّهَ شَدِيدُ ٱلْعِقَابِ
dhālika bi-annahum shāqqū l-laha warasūlahu waman yushāqqi l-laha fa-inna l-laha shadīdu l-ʿiqābi
because they set themselves against God and His Messenger: God is stern in punishment towards anyone who sets himself against Him.
That is because they opposed Allâh and His Messenger (Muhammad صلى الله عليه وسلم). And whosoever opposes Allâh, then verily, Allâh is Severe in punishment.