ذَلِكَ بِأَنَّ اللّهَ نَزَّلَ الْكِتَابَ بِالْحَقِّ وَإِنَّ الَّذِينَ اخْتَلَفُواْ فِي الْكِتَابِ لَفِي شِقَاقٍ بَعِيدٍ
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سورة البقرة
(2/176) This (torment) is because Allah has sent down the Book with the truth. And those who seek differences in the Book are in open schism.
Surah Al-Baqarah