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وَ لَوْ شَاءَ اللَّهُ لَجَعَلَكُمْ أُمَّةً وَاحِدَةً وَ لَٰكِنْ يُضِلُّ مَنْ يَشَاءُ وَ يَهْدِي مَنْ يَشَاءُ ۚ وَ لَتُسْأَلُنَّ عَمَّا كُنْتُمْ تَعْمَلُونَ
And if Allah please He would certainly make you a single nation, but He causes to err whom He pleases and guides whom He pleases; and most certainly you will be questioned as to what you did.