Ash-Shura - 42:52

وَكَذَلِكَ أَوْحَيْنَا إِلَيْكَ رُوحًا مِّنْ أَمْرِنَا مَا كُنتَ تَدْرِي مَا الْكِتَابُ وَلَا الْإِيمَانُ وَلَكِن جَعَلْنَاهُ نُورًا نَّهْدِي بِهِ مَنْ نَّشَاء مِنْ عِبَادِنَا وَإِنَّكَ لَتَهْدِي إِلَى صِرَاطٍ مُّسْتَقِيمٍ
[42:52]
And thus did We reveal to you an inspired book by Our command. You did not know what the Book was, nor (what) the faith (was), but We made it a light, guiding thereby whom We please of Our servants; and most surely you show the way to the right path:
And thus have We, by Our Command, sent inspiration to thee: thou knewest not (before) what was Revelation, and what was Faith; but We have made the (Qur'an) a Light, wherewith We guide such of Our servants as We will; and verily thou dost guide (men) to the Straight Way,-
And thus have We inspired in thee (Muhammad) a Spirit of Our command. Thou knewest not what the Scripture was, nor what the Faith. But We have made it a light whereby We guide whom We will of Our bondmen. And lo! thou verily dost guide unto a right path,