Quran 42:14 from Surah Ash-Shura on Divine Marvels.
وَمَا تَفَرَّقُوٓاْ إِلَّا مِنۢ بَعۡدِ مَا جَآءَهُمُ ٱلۡعِلۡمُ بَغۡيَۢا بَيۡنَهُمۡۚ وَلَوۡلَا كَلِمَةٞ سَبَقَتۡ مِن رَّبِّكَ إِلَىٰٓ أَجَلٖ مُّسَمّٗى لَّقُضِيَ بَيۡنَهُمۡۚ وَإِنَّ ٱلَّذِينَ أُورِثُواْ ٱلۡكِتَٰبَ مِنۢ بَعۡدِهِمۡ لَفِي شَكّٖ مِّنۡهُ مُرِيبٖ
English translation: And not they became divided until after after [what] came to them the knowledge (out of) rivalry among them And if not (for) a word (that) preceded from your Lord for a term specified surely, it (would have) been settled between them And indeed those who were made to inherit the Book after them after them (are) surely in doubt concerning it disquieting
Transliteration: wama tafarraqu illa min ba'di ma jaahumu al-'il'mu baghyan baynahum walawla kalimatun sabaqat min rabbika ila ajalin musamman laqudiya baynahum wa-inna alladhina urithu al-kitaba min ba'dihim lafi shakkin min'hu muribin