(The Caliph `Uthman ordered Zaid bin Thabit, Sa`id bin Al-As, `Abdullah bin Az-Zubair and `Abdur- Rahman bin Al-Harith bin Hisham to write the Qur'an in the form of a book (Mushafs) and said to them. "In case you disagree with Zaid bin Thabit (Al-Ansari) regarding any dialectic Arabic utterance of the Qur'an, then write it in the dialect of Quraish, for the Qur'an was revealed in this dialect." So they did it.
Sahih al-Bukhari Book 66, Hadith 6
← Previous Hadith Once the Prophet (ﷺ) fell ill and did not offer the night prayer (Tahajjud prayer) for a night or two. A woman (the wife of Abu Lahab) came to him and said, "O Muhammad ! I do not see but that your Satan has left you." Then Allah revealed (Surat-Ad-Duha): 'By the fore-noon, and by the night when it darkens (or is still); Your Lord has not forsaken you, nor hated you.' (93)

Sahih al-Bukhari Book 66, Hadith 5 Next Hadith → Ya`la used to say, "I wish I could see Allah's Messenger (ﷺ) at the time he is being inspired Divinely." When the Prophet (ﷺ) was at Al-Ja'rana and was shaded by a garment hanging over him and some of his companions were with him, a man perfumed with scent came and said, "O Allah's Messenger (ﷺ)! What is your opinion regarding a man who assumes Ihram and puts on a cloak after perfuming his body with scent?" The Prophet (ﷺ) waited for a while, and then the Divine Inspiration descended upon him. `Umar pointed out to Ya`la, telling him to come. Ya`la came and pushed his head (underneath the screen which was covering the Prophet (ﷺ) ) and behold! The Prophet's face was red and he kept on breathing heavily for a while and then he was relieved. Thereupon he said, "Where is the questioner who asked me about `Umra a while ago?" The man was sought and then was brought before the Prophet (ﷺ) who said (to him), "As regards the scent which you perfumed your body with, you must wash it off thrice, and as for your cloak, you must take it off; and then perform in your `Umra all those things which you perform in Hajj."

Sahih al-Bukhari Book 66, Hadith 7