Reddit reply in r/muslimtechnet: tell me about islam — October 9, 2022 · irnskyf | Ali Shukri Amin

What Is the Qur'an?
The Qur'an is Allah's verbatim Speech. Allah Revealed His Speech to the archangel Gabriel (Jibril) and instructed him to give it to the Prophet Muhammad ﷺ over his twenty-three years of Prophethood. The Qur'an was Revealed and recited orally, then written down entirely during the life of the Prophet ﷺ by his companions (sahabah). It was memorized in its entirety by many sahabah and compiled in one standardized volume by the end of the reign of his first successor (two years after his death).
Zayd ibn Arqam (May Allah be pleased with him) said:
فمنها حديث زيد بن أرقم رضي الله عنه -الذي سبق في باب إكرام أهل بيت رسول الله صلى الله عليه وسلم -قال: قام رسول الله صلى الله عليه وسلم فينا خطيباً، فحمد الله، وأثنى عليه، ووعظ وذكر، ثم قال: “أما بعد”ألا أيها الناس إنما أنا بشر يوشك أن يأتي رسول الله ربي فأجيب، وأنا تارك فيكم ثقلين : " أولهما: كتاب الله، فيه الهدى والنور، فخذو بكتاب الله، واستمسكوا به” فحث على كتاب الله، ورغب فيه، ثم قال: “وأهل بيتي، أذكركم الله في أهل بيتي" ((رواه مسلم)) وقد سبق بطوله.
"One day the Messenger of Allah (ﷺ) stood amongst us to deliver a Khutbah. So he praised Allah, extolled Him, exhorted and reminded (us) and said: 'Amma Ba'du (now then)! O people, certainly I am a human being. I am about to receive a messenger of Allah my Lord (the angel of death) and I respond.
And I am leaving among you two weighty things: There first of which is the Book of Allah. In it is guidance and light, so hold fast to the Book of Allah and adhere to it.' So he exhorted (us to hold fast to it) and encouraged it then said, 'And the members of my household, I remind you of Allah with regards (of your duties) to the members of my family."'
\[Sahih Muslim\]