Hud 11:118

وَلَوْ شَآءَ رَبُّكَ لَجَعَلَ ٱلنَّاسَ أُمَّةً وَٰحِدَةً ۖ وَلَا يَزَالُونَ مُخْتَلِفِينَ

Walaw shāa rabbuka lajaʿala l-nāsa ummatan wāḥidatan walā yazālūna mukh'talifīna

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