Who wrote the Qur’aan and how was it put together?

Praise be to Allaah. Firstly: Allaah has guaranteed to preserve this Qur’aan Himself. Allaah says (interpretation of the meaning): “Verily, We, it is We Who have sent down the Dhikr (i.e. the Qur’aan) and surely, We will guard it (from corruption)” [al-Hijr 15:9] Ibn Jareer al-Tabari said in his Tafseer, 14/8: Allaah is saying, it …