Surah Hud (Hud), Verse 118

وَلَوْ شَآءَ رَبُّكَ لَجَعَلَ النَّاسَ اُمَّةً وَّاحِدَةً وَّلَا یَزَالُوْنَ مُخْتَلِفِیْنَ ۟

Wa law shaaa'a Rabbuka laja'alannnaasa ummatanw waa hidatanw wa laa yazaaloona mukhtalifeen

“If thy Lord had so willed, He could have made mankind one people: but they will not cease to dispute.”

Quran 11:118 (Yusuf Ali Translation)