(8) باب التَّوَاطُؤُ عَلَى الرُّؤْيَا
Narrated Ibn `Umar:
Some people were shown the Night of Qadr as being in the last seven days (of the month of Ramadan). The Prophet (ﷺ) said, "Seek it in the last seven days (of Ramadan).
Reference: Sahih al-Bukhari 6991
In-book reference: Book 91, Hadith 10
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 87, Hadith 120