Surah Ash-Shura (The Consultation), Verse 8

وَلَوْ شَآءَ اللّٰهُ لَجَعَلَهُمْ اُمَّةً وَّاحِدَةً وَّلٰكِنْ یُّدْخِلُ مَنْ یَّشَآءُ فِیْ رَحْمَتِهٖ وَالظّٰلِمُوْنَ مَا لَهُمْ مِّنْ وَّلِیٍّ وَّلَا نَصِیْرٍ ۟

Wa law shaaa'al laahu laja'alahum ummatanw waahi datanw walaakiny yudkhilumany yashaaa'u fee rahmatih; waz zaalimoona maa lahum minw waliyyinw wa laa naseer

“If Allah had so willed, He could have made them a single people; but He admits whom He will to His Mercy; and the Wrong-doers will have no protector nor helper.”

Quran 42:8 (Yusuf Ali Translation)