Sahih Bukhari Volume 005, Book 059, Hadith Number 746.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 59. Military Expeditions Led by the Prophet (PBUH) (Al-Maghaazi)
Narrated By Ibn Abu Habib : Abu Al-Khair said, "As-Sanabih, I asked (me), 'When did you migrate?' I (i.e. Abu Al-Khair) said, 'We went out from Yemen as emigrants and arrived at Al-Juhfa, and there came a rider whom I asked about the news. The rider said: We buried the Prophet five days ago." I asked (As-Sanabihi), 'Did you hear anything about the night of Qadr?' He replied, 'Bilal, the Mu'adhdhin of the Prophet informed me that it is on one of the seven nights of the last ten days (of Ramadan)."