Laylat Al-Qadr (The Night of Decree) is in the last ten days of Ramadan, as stated in the narration of Ibn ‘Umar, may Allah be pleased with him, that the Prophet, sallallaahu 'alaihi wa sallam, said: “Seek Laylat Al-Qadr in the last ten days of Ramadan.” [Muslim]
It is more likely to be one of the odd-numbered nights, because of the narration of ‘Aa’ishah, may Allah be pleased with her, who said that the Messenger of Allah, sallallaahu ‘alaihi wa sallam, had said: “Seek Laylat Al-Qadr in the odd-numbered nights of the last ten nights.” [Al-Bukhari]
We should seek it especially in the odd-numbered nights, i.e., on the 21st, the 23rd, the 25th, the 27th and the 29th. It was also reported that the Prophet, sallallaahu 'alaihi wa sallam, said: “Seek it in the last ten nights, on the odd-numbered nights.” [Al-Bukhari and Muslim]
It is most likely to be on the night of the 27th. This is according to the saying of the Prophet, sallallaahu 'alaihi wa sallam: “Laylat Al-Qadr is the night of the 27th.” [Ahmad and Abu Daawood] The view that it is the night of the 27th is the opinion of most of the Companions, may Allah be pleased with them, and the majority of scholars. Ubayy ibn Ka’b, may Allah be pleased with him, used to assert, without saying “Insha Allah - God willing” that: “...it was the night of the 27th. Zurr ibn Hubaysh, may Allah be pleased with him, said to Ubayy, may Allah be pleased with him: ‘I said: What makes you say that, O Abu’l-Munthir (i.e. Ubay)?’ He, may Allah be pleased with him, said: ‘By the signs of which the Messenger of Allah, sallallaahu ‘alaihi wa sallam, told us: that the sun rises that morning with no visible rays.’” [Muslim]
The fact that it is more likely the night of the 27th –Allah knows best – does not mean that this is always the case. It could be any of the other odd-numbered nights of the last ten days of Ramadan. Some of the scholars ruled that it is more likely that it moves and does not come on a specific night each year.
Allah has concealed this night so that His slaves will strive to seek it, and will strive hard in worship, just as He has concealed the blessed hour of Friday.
Therefore, we should strive hard during the days and nights of these 10 days, seeking Laylat Al-Qadr and following the example of our Prophet, sallallaahu ‘alaihi wa sallam, and we should strive in supplication and seeking to draw close to Allah Almighty.
Article source: http://www.islamweb.net/emainpage/