ذَٰلِكَ بِأَنَّهُمْ شَآقُّوا۟ ٱللَّهَ وَرَسُولَهُۥ ۚ وَمَن يُشَاقِقِ ٱللَّهَ وَرَسُولَهُۥ فَإِنَّ ٱللَّهَ شَدِيدُ ٱلْعِقَابِ
That is because they opposed Allāh and His Messenger. And whoever opposes Allāh and His Messenger - indeed, Allāh is severe in penalty.
Dimensional Analysis
Context
Remember thy Lord inspired the angels (with the message): "I am with you: give firmness to the Believers: I will instil terror into the hearts of the Unbelievers: smite ye above their necks and smite all their finger-tips off them."
This because they contended against Allah and His Messenger: If any contend against Allah and His Messenger, Allah is strict in punishment.
Thus (will it be said): "Taste ye then of the (punishment): for those who resist Allah, is the penalty of the Fire."
Related Verses
واللهُ أعلمُ بالصَّواب