وَلَوْ شَاء اللّهُ لَجَعَلَكُمْ أُمَّةً وَاحِدَةً وَلكِن يُضِلُّ مَن يَشَاء وَيَهْدِي مَن يَشَاء وَلَتُسْأَلُنَّ عَمَّا كُنتُمْ تَعْمَلُونَ
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سورة النحل
(16/93) And had Allah willed, He would have made you all one community, but he sendeth astray whomsoever He willeth, and guideth whomsoever He willeth; and surely ye shall be questioned regarding that which ye have been working.
Surah An-Nahl