Sura 10 Yunus (Jonas), ayah 19

1. وَمَا كَانَ النَّاسُ إِلَّا أُمَّةً وَاحِدَةً فَاخْتَلَفُوا ۚ وَلَوْلَا كَلِمَةٌ سَبَقَتْ مِنْ رَبِّكَ لَقُضِيَ بَيْنَهُمْ فِيمَا فِيهِ يَخْتَلِفُونَ

   And mankind was not but one community (united in religion), but (then) they differed. And if not for a word that preceded from your Lord, it would have been judged between them (immediately) concerning that over which they differ.

   10:19

Translation: Saheeh International