This is because God has revealed this scripture, bearing the truth, and those who dispute the scripture are the most ardent opponents.
ذٰلِكَ بِأَنَّ اللَّهَ نَزَّلَ الكِتٰبَ بِالحَقِّ وَإِنَّ الَّذينَ اختَلَفوا فِى الكِتٰبِ لَفى شِقاقٍ بَعيدٍ
zaalika bi annal laaha nazzalal kitaaba bilhaqq; wa innal lazeenakh talafoo fil kitaabi lafee shiqaaqim ba’eed