Narrated Ibn `Abbas: The Prophet said, "Look for the Night of Qadr in the last ten nights of Ramadan ,' on the night when nine or seven or five nights remain out of the last ten nights of Ramadan (i.e. 21, 23, 25, respectively).
Hadith ReferenceSahih Bukhari / The Book of Superiority of The Night of Qadr / Hadith: 2021
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة