After his first encounter with the Angel of Revelation in the Cave of Hira, the Prophet went home trembling and asked his wife to cover him with his cloak. The first verses of this Meccan sura were then revealed (verses 1–7). The sura goes on, in a section from a later period, to remind the obstinate disbelievers of their fate on the Day of Judgement (verses 8–10) and a specific opponent of the Prophet is singled out (verses 11–31). The end of the sura (verses 39–53) exposes the foolishness of the disbelievers’ attitude to the Revelation and the Day of Resurrection.
Source: The Qur’an (Oxford World’s Classics) by M. A. S. Abdel Haleem (Amazon Kindle Edition)