The Qur’an (Arabic: القرآن al-qur’ān, literally "the recitation"; also sometimes transliterated as Qur’ān, Koran, Alcoran or Al-Qur’ān) is the central religious text of Islam. Muslims believe the Qur’an to be the book of divine guidance and direction for mankind, and consider the original Arabic text to be the final revelation of God. Islam holds that the Qur’an was revealed to Muhammad by the angel Jibrīl (Gabriel) over a period of 23 years. Muslims regard the Qur’an as the culmination of a series of divine messages that started with those revealed to Adam, regarded in Islam as the first prophet, and continued with the Suhuf Ibrahim (Scrolls of Abraham), the Tawrat (Torah), the Zabur (Psalms), and the Injeel (Gospel). The aforementioned books are not explicitly included in the Qur’an, but are recognized therein. The Qur’an also refers to many events from Jewish and Christian scriptures, some of which are retold in comparatively distinctive ways from the Bible and the Torah, while obliquely referring to other events described explicitly in those texts.
The revelation of the Qur'an began in the laila al-qadr of Ramadan (one of the odd nights after the 21st till end Ramadan) after the Prophet Muhammad had passed the fortieth year of his life (that is around the year 610), during his seclusion in the cave of Hira' on a mountain near Makka.