That is because they opposed Allah and His Messenger. Whoever opposes Allah and His Messenger—Allah is severe in retribution.
Al-Anfal 8:13
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ذَٰلِكَ بِأَنَّهُمْ شَاقُّوا اللَّهَ وَرَسُولَهُ ۚ وَمَنْ يُشَاقِقِ اللَّهَ وَرَسُولَهُ فَإِنَّ اللَّهَ شَدِيدُ الْعِقَابِ
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That is because they opposed God and His Messenger. Whoever opposes God and His Messenger—God is severe in retribution.
This is because they fought against Allah and His Messenger. Whoever fights against Allah and His Messenger, Allah's punishment is very severe.
This is because they opposed Allah and His Messenger. Whoever opposes Allah and His Messenger, Allah is severe in punishment.
That is because they opposed God and His Messenger. And whoever opposes God and His Messenger — then surely God is severe in punishment.
That is because they defied Allah and His Messenger. Whoever defies Allah and His Messenger—Allah is severe in retribution.
That is because they defied God and His Messenger. Whoever defies God and His Messenger—God is severe in retribution.
That is because they opposed Allāh and His Messenger. And whoever opposes Allāh and His Messenger - indeed, Allāh is severe in penalty.
This is because they defied and disobeyed Allâh and His Messenger. And whoever defies and disobeys Allâh and His Messenger, then verily, Allâh is Severe in punishment.
That is because they opposed Allah and His Messenger. Whoever opposes Allah and His Messenger, Allah is indeed severe in punishment.
This because they contended against Allah and His Messenger: If any contend against Allah and His Messenger, Allah is strict in punishment.
That is because they opposed Allah and His messenger. Whoso opposeth Allah and His messenger, (for him) lo! Allah is severe in punishment.
That was because they defied God and His Messenger. He who defies God and His Messenger shall be severely punished by God.
This is because they defied Allah and His Messenger. Whoever defies Allah and His Messenger must know that Allah is severe in punishment.
That, because they defied Allah and His Apostle. And whoever defies Allah and His Apostle, Allah is indeed severe in retribution.
Thalika biannahum shaqqoo Allaha warasoolahu waman yushaqiqi Allaha warasoolahu fainna Allaha shadeedu alAAiqabi