وَما كانَ النّاسُ إِلّا أُمَّةً واحِدَةً فَاختَلَفوا ۚ وَلَولا كَلِمَةٌ سَبَقَت مِن رَبِّكَ لَقُضِيَ بَينَهُم فيما فيهِ يَختَلِفونَ

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.