Surah al-`Alaq (The Clinging Substance) 96 : 18

This Surah has two parts: the first part consists of v. 1-5, and the second of v. 6-19. About the first part, a great majority of the Islamic scholars are in agreement that it forms the very first Revelation to be sent down to the Prophet. In this regard, the hadith from the Prophets wife (A’isha), which Imam Ahmad, Bukhari, Muslim, and other traditionists have related with several chains of authorities, is one of the most authentic hadith on the subject. In it A’isha has narrated the full story of the beginning of revelation as she herself heard it from the Messenger of God. Besides, Ibn Abbas, Abu Musa al-Ashari and a group of the Companions also are reported to have stated that these were the very first verses of the Qur’an to be revealed to the Prophet. The second part was sent down afterwards when the Prophet began to perform the prescribed Prayer in the precincts of the Ka’bah and his arch enemy (Abu Jahl) tried to prevent him from this with threats.