Dalil
العربية

Quran Hud 11:118

وَلَوۡ شَآءَ رَبُّكَ لَجَعَلَ ٱلنَّاسَ أُمَّةٗ وَٰحِدَةٗۖ وَلَا يَزَالُونَ مُخۡتَلِفِينَ

Translation

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