ذٰلِكَ بِأَنَّ اللَّهَ نَزَّلَ الكِتابَ بِالحَقِّ ۗ وَإِنَّ الَّذينَ اختَلَفوا فِي الكِتابِ لَفي شِقاقٍ بَعيدٍ

That is [deserved by them] because Allah has sent down the Book in truth. And indeed, those who differ over the Book are in extreme dissension.