And if your Lord had willed, He could have made mankind one community; but they will not cease to differ.
The Saheeh International Quran Translation
وَلَوْ شَآءَ رَبُّكَ لَجَعَلَ ٱلنَّاسَ أُمَّةً وَٰحِدَةً وَلَا يَزَالُونَ مُخْتَلِفِينَAnd if your Lord had willed, He could have made mankind one community; but they will not cease to differ.