Qur'an 42:52

وَكَذَٰلِكَ أَوْحَيْنَآ إِلَيْكَ رُوحًا مِّنْ أَمْرِنَا ۚ مَا كُنتَ تَدْرِى مَا ٱلْكِتَـٰبُ وَلَا ٱلْإِيمَـٰنُ وَلَـٰكِن جَعَلْنَـٰهُ نُورًا نَّهْدِى بِهِۦ مَن نَّشَآءُ مِنْ عِبَادِنَا ۚ وَإِنَّكَ لَتَهْدِىٓ إِلَىٰ صِرَٰطٍ مُّسْتَقِيمٍ

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,