Laylat al-Qadr
The Quran uses the word "anzal" () which justifies 'the immediate revelation', according to Allamah Tabatabai. However some others believe that the revelation of Quran occurred in two phases, with the first phase being the revelation in its entirety on Laylat al-Qadr to the angel Gabriel (Jibril in Arabic) in the lowest heaven, and then the subsequent verse-by-verse revelation to Prophet Muhammad by Gabriel. The revelation started in 610 CE at the Hira cave on Mount Jabal al-Nour in Mecca. The first Surah that was revealed was Sūrat al-ʿAlaq (in Arabic ). During Prophet Muhammad's first revelation, the first five verses of this Surah, or chapter, were revealed.