Lailat-ul-Qader (Night of Decree/Power) Muabark to all as Allah said about it
1. Verily! We have sent it (this Qur'an) down in the night of Al-Qadr (Decree)2. And what will make you know what the night of Al-Qadr (Decree) is?3. The night of Al-Qadr (Decree) is better than a thousand months (i.e. worshipping Allah in that night is better than worshipping Him a thousand months, i.e. 83 years and 4 months).4. Therein descend the angels and the Ruh [Jibrael (Gabriel)] by Allah's Permission with all Decrees, 5. Peace! (All the night, there is peace and Goodness from Allah to his believing slaves) until the appearance of dawn. (Surah 97 Al Qadr)
The Prophet (May peace be upon him) said, "Whoever fasted the month of Ramadan out of sincere Faith (i.e. belief) and hoping for a reward from Allah, then all his past sins will be forgiven, and whoever stood for the prayers in the night of Qadr out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven ." Bukhari, Volume 3, Book 32, Number 231
Allah's Apostle said, "Search for the Night of Qadr in the odd nights of the last ten days of Ramadan." Bukhari, Volume 3, Book 32, Number 234
Dua for Lailat-ul-Qadr is from "Tirmadhi hadith # 3513 & Ibn e Majah hadith # 3850"