Quran 2:176 from Surah Al-Baqara on Divine Marvels.
ذَٰلِكَ بِأَنَّ ٱللَّهَ نَزَّلَ ٱلۡكِتَٰبَ بِٱلۡحَقِّۗ وَإِنَّ ٱلَّذِينَ ٱخۡتَلَفُواْ فِي ٱلۡكِتَٰبِ لَفِي شِقَاقِۭ بَعِيدٖ
English translation: That (is) because Allah revealed the Book with [the] Truth And indeed those who differed in the Book (are) surely in schism far
Transliteration: dhalika bi-anna al-laha nazzala al-kitaba bil-haqi wa-inna alladhina ikh'talafu fi al-kitabi lafi shiqaqin ba'idin