Surah Ad-Dukhaan (44) — Ayah 3

The tafsir of this verse may be read with the following verses.

3. 1. The blessed night (لَیْلَۃُ الْقَدْرِ) refers to Laylat al-Qadr, as is explicitly mentioned at another place (شَهْرُ رَمَضَانَ الَّذِيْٓ اُنْزِلَ فِيْهِ الْقُرْاٰنُ) 2. (al-Baqarah:185) The Quran was revealed in the month of Ramadan; this Laylat al-Qadr is one of the odd nights of the last ten nights of Ramadan. Here, the Night of Decree is called the blessed night. How can there be any doubt about its being blessed, when firstly, the Quran was revealed in it; secondly, the angels and the Spirit (Jibril) descend in it; thirdly, all the events to occur in the coming year are decided in it (as will be mentioned ahead); and fourthly, worship in this night is better than worship of a thousand months (83 years and 4 months). The meaning of the Quran’s revelation in Laylat al-Qadr or the blessed night is that from this very night, the revelation of the Quran to the Prophet ﷺ began. That is, for the first time, the Quran was revealed to him in this night, or it means that from the Preserved Tablet, the Quran was sent down to Bayt al-‘Izzah, which is in the lowest heaven, on this night. Then from there, as needed and as appropriate, it continued to be revealed to the Prophet ﷺ over a period of 33 years at different times.

3. Indeed, We sent it down on a blessed [1] night, for surely We intended to warn [2].

[1]
﴿ليلة القدر﴾ and Shab-e-Barat are the Same Night:

That is, the night in which the Quran was revealed was a night of great goodness and blessing. Because on this night, arrangements were being made for the guidance of the entire world. At this place, this night has been called ﴿لَیْلَۃٍ مُّبَارَکَۃٍ﴾, and in Surah Al-Qadr, it is called ﴿لَيْلَةُ الْقَدْرِ﴾, meaning the night of great value and status, or the night in which important matters are decided, as is clarified in the next verse. The meaning of both is the same; in other words, the same night is called ﴿لَیْلَۃٍ مُّبَارَکَۃٍ﴾ here and ﴿لَيْلَةُ الْقَدْرِ﴾ in Surah Al-Qadr. And it is also explicitly mentioned in Surah Al-Baqarah that this night was a night of the blessed month of Ramadan. [2: 185]
And in authentic hadiths, it is also explicitly mentioned that this night is one of the odd nights of the last ten nights of Ramadan. And according to most opinions, it is the twenty-seventh night of Ramadan. However, based on some unauthentic narrations, some people have considered these to be two separate nights, that is, they understood ﴿لَيْلَةُ الْقَدْرِ﴾ to be in the last ten nights of Ramadan, and ﴿لَيْلَةٍ مُّبَارَكَةٍ﴾ to be the fifteenth night of the month of Sha'ban, and named it Shab-e-Qadr or Shab-e-Barat. Whereas the word "Shab" is the Persian translation of ﴿ليلة﴾, and the word "Barat" was used in place of "Qadr." Thus, by translating ﴿لَيْلَةُ الْقَدْرِ﴾ into Persian, they made it into another night and started celebrating its festival, and began to set off firecrackers and fireworks on it. In other words, what the Hindus do on the occasion of Dussehra, the Muslims, by associating it with Shab-e-Barat, fulfilled their desire for celebrating festivals. As for the question of whether the entire Quran was revealed on this night, as apparently understood from this Surah and Surah Al-Qadr, the answer is that the entire Quran was transferred from the Preserved Tablet to the angels, especially Jibreel (Gabriel) عليه السلام, or the entire Quran was sent down to the lowest heaven. Then, from there, it was revealed to the Messenger of Allah ﷺ as needed over twenty-three years. However, the first five verses of Surah Al-Alaq were revealed to the Messenger of Allah ﷺ in the Cave of Hira on this very night.

[2] That is, our purpose in revealing the Noble Quran was that, through it, all the people of the world may be warned about their end, and they may be warned of the punishment for their misguidance and evil deeds.