The clarity and perfection of Islamic guidance

ذَٰلِكَ بِأَنَّ ٱللَّهَ نَزَّلَ ٱلْكِتَـٰبَ بِٱلْحَقِّ ۗ وَإِنَّ ٱلَّذِينَ ٱخْتَلَفُوا۟ فِى ٱلْكِتَـٰبِ لَفِى شِقَاقٍۭ بَعِيدٍ

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