Surah Ash-Shura, Verse 8
وَلَوْ شَآءَ ٱللَّهُ لَجَعَلَهُمْ أُمَّةًۭ وَٰحِدَةًۭ وَلَٰكِن يُدْخِلُ مَن يَشَآءُ فِى رَحْمَتِهِۦ ۚ وَٱلظَّٰلِمُونَ مَا لَهُم مِّن وَلِىٍّۢ وَلَا نَصِيرٍ
Translation — Sahih International
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.
Source
Kur'an-ı Kerim, Şûrâ Suresi 42:8
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/42-suresi-8-ayet