وَمَا تَفَرَّقُوْٓا اِلَّا مِنْۢ بَعْدِ مَا جَاۤءَهُمُ الْعِلْمُ بَغْيًاۢ بَيْنَهُمْۗ وَلَوْلَا كَلِمَةٌ سَبَقَتْ مِنْ رَّبِّكَ اِلٰٓى اَجَلٍ مُّسَمًّى لَّقُضِيَ بَيْنَهُمْۗ وَاِنَّ الَّذِيْنَ اُوْرِثُوا الْكِتٰبَ مِنْۢ بَعْدِهِمْ لَفِيْ شَكٍّ مِّنْهُ مُرِيْبٍ ( الشورى: ١٤ )
Wa maa tafarraqooo illaa mim ba'di maa jaaa'ahumul 'ilmu baghyam bainahum; wa law laa Kalimatun sabaqat mir Rabbika ilaaa ajalim musammal laqudiya bainahum; wa innal lazeena oorisul Kitaaba mim ba'dihim lafee shakkim minhu mureeb (aš-Šūrā 42:14)
And they did not become divided until after knowledge had come to them – out of jealous animosity between themselves. And if not for a word that preceded from your Lord [postponing the penalty] until a specified time, it would have been concluded between them. And indeed, those who were granted inheritance of the Scripture after them are, concerning it, in disquieting doubt. (Ash-Shuraa  : 14)
1 Mufti Taqi Usmani
And they were not divided, in jealousy with each other, but after the knowledge had come to them. Had it not been for a word that had come forth earlier from your Lord (and was effective) until a specified time, the matter would have been decided between them. And those who were made to inherit the Book after them are in confounding doubt about it.