[5] According to various hadiths, its exact date is uncertain but was one of the odd-numbered nights of the last ten days of Ramadan, the ninth month of the Islamic calendar.

[8] Some reasons have been offered for its naming: Other names such as "Laylat al-'Azama" (Arabic: ليلة العظمة; night of the greatness) and "Laylat al-Sharaf" (Arabic: ليلة الشرف; lit.

[3] The revelation started in 610 CE at the Hira cave on Mount Jabal al-Nour in Mecca.

According to one hadith, Muhammad said: "Whoever stands [in prayer] during the Night of Power out of belief and seeking reward, his previous sins are forgiven."

(Sahih al-Bukhari 1901)[16][17] A specific date of Laylat al-Qadr is not mentioned in the Quran.

[25] The 19th, according to the Shia belief, coincides with the night Ali was attacked in the Mihrab while worshipping in the Great Mosque of Kufa.

Gabriel who is my brother among the angels informs me of the events of one year of my nation at the night of Qadr.

Devout Muslims practice spiritual retreat (Iʿtikāf) during the last ten days of Ramadan, awaiting the Night of Power, fasting and praying throughout the night, and abstaining from sexual relations.

Other rituals of the night include donations of dawn food, payment of their nadhr for the dead, feeding the poor, and emancipation of financial prisoners.

Since the assassination of Ali occurred in the last ten days of the Ramadan month, Shi'as mourn in these nights.