Ash-Shura, 8 Ayah
42:8
وَلَوۡ شَآءَ ٱللَّهُ لَجَعَلَهُمۡ أُمَّةٗ وَٰحِدَةٗ وَلَٰكِن يُدۡخِلُ مَن يَشَآءُ فِي رَحۡمَتِهِۦۚ وَٱلظَّٰلِمُونَ مَا لَهُم مِّن وَلِيّٖ وَلَا نَصِيرٍ ٨
Wa Law Shā'a Al-Lahu Laja`alahum 'Ummatan Wāĥidatan Wa Lakin Yudkhilu Man Yashā'u Fī Raĥmatihi Wa ۚ Až-Žālimūna Mā Lahum Min Wa Līyin Wa Lā Naşīrin
And if Allah willed, He could have made them [of] one religion, but He admits whom He wills into His mercy. And the wrongdoers have not any protector or helper.