Ash-shûrâ 42:52
وَكَذَٰلِكَ أَوْحَيْنَا إِلَيْكَ رُوحًا مِّنْ أَمْرِنَا ۚ مَا كُنتَ تَدْرِي مَا الْكِتَابُ وَلَا الْإِيمَانُ وَلَٰكِن جَعَلْنَاهُ نُورًا نَّهْدِي بِهِ مَن نَّشَاءُ مِنْ عِبَادِنَا ۚ وَإِنَّكَ لَتَهْدِي إِلَىٰ صِرَاطٍ مُّسْتَقِيمٍ ٥٢
Wakathalika awhayna ilayka roohan min amrina ma kunta tadree ma alkitabu wala aleemanu walakin jaAAalnahu nooran nahdee bihi man nashao min AAibadina wainnaka latahdee ila siratin mustaqeemin
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So thus We revealed to you Our Spirit (of hearts and souls) by Our command (that is the Qur’an). And (before the Revelation) you did not know what the Book was, nor did you know (through your own endeavour and insight the details of the injunctions of) faith (which were sent down and determined later). (42:52)