Ash-Shuraa 42:8
وَلَوْ شَآءَ ٱللَّهُ لَجَعَلَهُمْ أُمَّةً وَٰحِدَةً وَلَـٰكِن يُدْخِلُ مَن يَشَآءُ فِى رَحْمَتِهِۦ ۚ وَٱلظَّـٰلِمُونَ مَا لَهُم مِّن وَلِىٍّ وَلَا نَصِيرٍ
Walaw shaa Allahu lajaAAalahumommatan wahidatan walakin yudkhilu man yashaofee rahmatihi waththalimoonama lahum min waliyyin wala naseer
And if Allāh 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.
Had Allah willed, He would have made all of them a single group; but He admits whomsoever He wills into His mercy. As for the wrongdoers, they have neither a patron nor a helper.