By the manifest Book (the Quran) that makes thing clear. We sent it (this Quraan) down on a Blessed Night (i.e. the Night of Qadr) in the month of Ramadaan..(44:2-5) So valuable is the Night of Qadr (Power) that the Quran devotes a special surah to it: “Lailatul Qadr is better than a thousand months” [97:3]
This one night surpasses the value of 30,000 nights. The most authentic account of the occurrence of the Night indicates that it can occur on any one of the last ten, odd numbered nights of Ramadan, 21, 23, 25, 27, 29. It may also occur on any of the even nights.
Therefore we should strive to stay up & worship on all of the last 10 nights of Ramadan. If we can’t do that then we should at least worship on the odd numbered nights of the last ten days. If we still can’t manage that then let us pray on whatever nights we can, minimum on the 27th night. There is NO doubt that if we pray on all of the last ten nights of Ramadan then we will catch this auspicious night & gain the rewards of over 83 YEARS OF IBAADAH! Subhaanallah! Most do not live upto such an age!
The following dua should be recited as much as possible during the last 10 nights of Ramadan: Ummul Mu’mineen, Sayyidatina Aisha (RA) said: I asked Nabi (Sallallahu Alaihi Wasallam): ‘O Messenger of Allah, if I know what night is the night of Qadr, what should I say during it?’
He said: “Allahumma innaka ‘afuwwun tuhibbul ‘afwa fa’fu ‘annee O Allah, You are pardoning & You love to pardon, so pardon me.’ “ (Ahmad, Ibn Majah, & Tirmidhi).
Forgiveness of past & present sins on Laylatul Qadr
Sayyiduna Abu Hurairah (RA) narrated that Nabi (Sallallahu`Alayhi Wa sallam) said: “Whoever stands (in qiyaam) in Laylat ul-Qadr out of faith and expectation (of Allah’s reward), will have ALL of his previous sins forgiven.” (Al-Bukhari and Muslim)