Quran 3:105 from Surah Aal-i-Imraan on Divine Marvels.
وَلَا تَكُونُواْ كَٱلَّذِينَ تَفَرَّقُواْ وَٱخۡتَلَفُواْ مِنۢ بَعۡدِ مَا جَآءَهُمُ ٱلۡبَيِّنَٰتُۚ وَأُوْلَٰٓئِكَ لَهُمۡ عَذَابٌ عَظِيمٞ
English translation: And (do) not be like those who became divided and differed from after what came to them the clear proofs And those for them (is) a punishment great
Transliteration: wala takunu ka-alladhina tafarraqu wa-ikh'talafu min ba'di ma jaahumu al-bayinatu wa-ulaika lahum adhabun azimun