Hazrat Ibn Umar (r) said,
“In the lifetime of Rasullullah (S), I dreamt that a piece of silk cloth was in my hand and it flew with me to whichever part of Jannah I wanted. I also saw as if two persons (i.e. angels) came to me and wanted to take me to Jahannam. Then an angel met us and told me not to be afraid. He then told them to leave me. Hafsa narrated one of my dreams to the Prophet and the Prophet (S) said, ‘Abdullah is a good man. Would that he offer the night prayer (Tahajjud)!’ So after that day ‘Abdullah (bin ‘Umar) started offering Tahajjud. The companions of Rasullullah (S) used to tell him their dreams that (Laylat-ul-Qadr) was on the 27th of the month of Ramadhaan. Rasullullah (S) said , “I see that your dreams agree on the last ten nights of Ramadhaan and so whoever is in search of it should seek it in the last ten nights of Ramadhaan.” (Bukhari)

Hazrat Abu Saeed Khudri (r) reports,
Rasullullah (S) once performed I’tikaaf for the first ten days of Ramadhaan. Thereafter he made I’tikaaf in a Turkish tent (inside the masjid) for the middle ten days. Thereafter he raised his head out of the tent and said, “Verily in search of Laylatul Qadr did I perform I’tikaaf for the first ten days, then for the middle ten days. Then someone (an angel) came and told me, “It is in the last ten days whosoever has made I’tikaaf with me should continue for the last ten days”. I had indeed been shown that night and then made to forget, which it shall be. And verily did I see myself prostrating to Allah with my forehead on mud on the morning after the night. Seek Laylatul Qadr in the last ten nights of Ramadhaan; seek it among uneven ones”. Hazrat Abu Saeed Khudri (r) says: “That same night it rained. The roof on the masjid leaked, and I looked at Rasullullah (S)’s two eyes and on his forehead were remains of water and mud. This was on the morning of the 21st, due to performing sujood in muddy clay”. (Mishkaat)

Hazrat Ayesha (r) reported that the amount of effort Rasullullah (S) put in worship in the last ten days of Ramadhaan was not equalled by the effort he put in the other days. (Muslim)

Hazrat Anas (r) reports,
“Once when Ramadhaan commenced, the Messenger of Allah (S) said: ‘A month has verily dawned over you;wherein lies a night (ie. Laylatul Qadr) better than a thousand months. Whoever misses such a night has indeed been deprived of all that is good; and none is deprived of it, except he who is really unfortunate.” (Ibn Majah)

Hazrat Abu Hurairah (r) reports that Rasullullah (S) said:
“Whoever stands in prayer and ibaadah on the night of Power(Laylatul Qadr) with sincere faith and with sincere hope of gaining reward, his previous sins are forgiven.” (At-Targheeb from Bukhari and Muslim)

Hazrat Ayesha (r) reports that Rasullullah (S) said:
“Seek “Laylatul Qadr” among the odd numbered nights of the last ten days of the month of Ramadhaan(ie. 21, 23, 25, etc.). ” (Mishkaat)

Hazrat Ubaadah bin Saamit (r) said:
‘Once Rasullullah (S) came out to inform us of the (true date of) “Laylatul Qadr”. Unfortunately, a quarrel took place between two Muslims, whereupon he said: “I came out to inform you as to when “Laylatul Qadr” occurs, but because two people quarrelled with each other, the knowledge of the correct date was taken away; perhaps that is better for you. Who knows that this forgetting was better in Allah’s knowledge of things. So, seek it among the ninth, seventh and fifth nights.” (Bukhari, Mishkaat)

Hazrat Ayesha (r) reports that Rasullullah (S) said: “Seek “Laylatul Qadr” among the odd numbered nights of the last ten days of the month of Ramadhaan.” (Mishkaat)

It comes in a Hadith that : “He who is deprived of Laylatul Qadr is as though he was deprived of all blessings. And only he deprives himself of the blessings of Laylatul Qadr who is totally deprived.” (Ibn Majah)

Hazrat Ayesha (r) reports: “I said: ‘O Messenger of Allah (S), should I find myself the “Laylatul Qadr”, what shall I pray. The Prophet (S) replied: say, Allaahumma innaka afuwwun tuhibbul ‘afwa fa’fu annie, “O Allah, You are the One who grants pardon for sinsYou love to pardon, so pardon me.” (Ahmad, Ibn Majah, Tirmidhi

http://attalib.blogspot.com/2008/09/ahadith-on-laylatul-qadr.html