Surah Hud, ayah 118

11:118

وَلَوۡ شَآءَ رَبُّكَ لَجَعَلَ ٱلنَّاسَ أُمَّةٗ وَٰحِدَةٗۖ وَلَا يَزَالُونَ مُخۡتَلِفِينَ ١١٨

Walaw shā'a rabbuka laja'alan-nāsa ummatan wāhidatan walā yazālūna mukhtalifīn

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