Laylat al-Qadr
Laylat al-Qadr occurs during an odd-numbered night within the last ten days of Ramadan, but its exact date is uncertain; due to the promises made in the chapter and in various hadith. Muslims consider it a particularly good time for prayer, supplication, and repentance to God. This event marks the descent of the first revelation of the Quran to Earth. The official Islamic teaching is that Muhammad received the revelations that formed the Quran piecemeal for the next twenty-three years of his life up until the time of his death. Shia Muslims believe that Ali (the first Shia Imam, and the fourth caliph of the Rashidun Caliphate to Sunnis) had special insight and intimacy with God on this night.