وَلَوۡ شَآءَ رَبُّكَ لَجَعَلَ النَّاسَ اُمَّةً وَّاحِدَةً وَّلَا يَزَالُوۡنَ مُخۡتَلِفِيۡنَۙ‏

And if your Lord had willed, He could have made mankind one community; but they will not cease to differ