Sahih al-Bukhari 4956Book 65, Hadith 478
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، ح وَقَالَ اللَّيْثُ حَدَّثَنِي عُقَيْلٌ، قَالَ مُحَمَّدُ أَخْبَرَنِي عُرْوَةُ، عَنْ عَائِشَةَ ـ رضى الله عنها. أَوَّلُ مَا بُدِئَ بِهِ رَسُولُ اللَّهِ صلى الله عليه وسلم الرُّؤْيَا الصَّادِقَةُ جَاءَهُ الْمَلَكُ فَقَالَ {اقْرَأْ بِاسْمِ رَبِّكَ الَّذِي خَلَقَ * خَلَقَ الإِنْسَانَ مِنْ عَلَقٍ * اقْرَأْ وَرَبُّكَ الأَكْرَمُ * الَّذِي عَلَّمَ بِالْقَلَمِ}
The commencement of (the Divine Inspirations to) Allah's Messenger (ﷺ) was in the form of true dreams. The Angel came to him and said, "Read! In the Name of your Lord Who has created all exists), has created man from a clot. Read! And your Lord is Most Generous, Who has taught (the writing) by the pen. (96.1-4)