Laylat Al-Qadr is the most virtuous night in the year. Almighty Allah says in the Qur’an: (We have indeed revealed this (Message) in the Night of Power: And what will explain to thee what the night of power is? The Night of Power is better than a thousand months.) (Al-Qadr 97:1-3)
thus, every Muslim should strive hard not to miss the opportunity in getting multiple rewards in these blessed days. One should draw nearer and nearer to Allah to get the blessings of Laylat Al-Qadr in this last third of Ramadan.
First, Imam Ahmad and Muslim narrated that the Messenger of Allah (peace and blessings be upon him) used to strive harder in worship during the last ten days of Ramadan than he ever did at any other time, praying, reciting the Qur’an, and making du`aa’. Al-Bukhari and Muslim narrated from `A’ishah (may Allah be pleased with her) that when the last ten days of Ramadan came, the Prophet (peace and blessings of be upon him) would stay up at night and would wake his family up and would abstain from marital relations.
Second, the Prophet (peace and blessings be upon him) enjoined staying up and praying on Laylat Al-Qadr out of faith and in the hope of reward. It was narrated from Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said, “Whoever stays up and prays on Laylat Al-Qadr out of faith and in the hope of reward, his previous sins will be forgiven.” (Reported by Al-Bukhari and Muslim)
the previous hadith indicates that it is prescribed to observe Laylat Al-Qadr by spending the night in Prayer.
Third, one of the best supplications that may be recited on Laylat Al-Qadr is that which the Prophet (peace and blessings be upon him) taught to `A’ishah (may Allah be pleased with her). At-Tirmidhi narrated, and classed the report as authentic, that `A’ishah said: I said, “O Messenger of Allah, if I know which night is Laylat Al-Qadr, what should I say on that night?” He said, “Say: Allaahumma innaka `afuwwun tuhibb al-`afwa fa`affu `anni (O Allah, You are forgiving and You love forgiveness, so forgive me).”
Fourth, with regard to specifying which night of Ramadan is Laylat Al-Qadr, this needs specific evidence, but the odd-numbered nights during the last ten nights are more likely than others, and the night of the 27th is the most likely to be Laylat Al-Qadr because that is mentioned in the Prophetic hadiths.