Al-Qadr is the 97th sura of the Qur’an with 5 ayat.
إِنَّآ أَنزَلۡنَـٰهُ فِى لَيۡلَةِ ٱلۡقَدۡرِ
We have indeed revealed this (Message) in the Night of Power: (1)
وَمَآ أَدۡرَٮٰكَ مَا لَيۡلَةُ ٱلۡقَدۡرِ
And what will explain to thee what the Night of Power is? (2)
لَيۡلَةُ ٱلۡقَدۡرِ خَيۡرٌ۬ مِّنۡ أَلۡفِ شَہۡرٍ۬
The Night of Power is better than a thousand Months. (3)
تَنَزَّلُ ٱلۡمَلَـٰٓٮِٕكَةُ وَٱلرُّوحُ فِيہَا بِإِذۡنِ رَبِّہِم مِّن كُلِّ أَمۡرٍ۬
Therein come down the angels and the Spirit (Jibreel) by Allah’s permission, on every errand: (4)
سَلَـٰمٌ هِىَ حَتَّىٰ مَطۡلَعِ ٱلۡفَجۡرِ
It’s all Peace!… until the rise of Morn (Dawn)! (5)
Laylat al-Qadr is the anniversary of the night that the Qur’an was revealed. The Revelation of the Qur’an occurred in two phases, with the first phase being the revelation in its entirety on Laylat Al-Qadr to Gabriel in the lowest heaven, and then the subsequent verse-by-verse revelation to Prophet Muhammad (SAW) by the angel Gabriel (Jibril). The revelation started in 610 CE at the Hira cave on Mount Nur in Mecca. The first Surat that was revealed was Surat Iqra. Iqra means ‘read’, the prophet was told to read by the angel Gabriel.
Laylat al-Qadr is to be found in the last five odd nights of the 3rd decade of Ramadan. There is no history in the Qur’an as to when the specific date is. Therefore in the Sunni communities of all the Islamic countries, the Laylat al-Qadar is found to be on the last nights of Ramadan. Mostly it is on one of the odd nights, i.e., 21st, 23rd, 25th, 27th or 29th night. And most probaly it falls on the 27th night of Ramadan. It is the night when Qur’an was revealed (as a whole on the 4th sky) and then was revealed piecemeal on the Holy Prophet Muhammad (SAW) in 23 years, 10 years in Makkah and 13 years in Madina. Qur’an says about Lailat al-Qadr in Surah ‘Qadr’ that this single night is better than thousand of months! Any action done on this night such as reciting the Quran, remembering Allah, etc. is better than acting for one thousand months which do not contain the night of Qadr. So Muslims remain engaged whole nigh in prayers and seek jannah for them.
Allah’s Messenger (SAW) used to exert himself in devotion during the last ten nights to a greater extent than at any other time. (Muslim).
Aisha, may Allah be pleased with her, related that the Prophet (SAW) said: Look for Laylat al-Qadr on an odd-numbered night during the last ten nights of Ramadan (Bukhari).
The Prophet (SAW) said: “Whoever prays during the night of Qadr with faith and hoping for its reward will have all of his previous sins forgiven.” (Bukhari and Muslim recorded from Abu Huraira).