(3) باب تَحَرِّي لَيْلَةِ الْقَدْرِ فِي الْوِتْرِ مِنَ الْعَشْرِ الأَوَاخِرِ
Narrated `Aisha:
Allah's Messenger (ﷺ) used to practice I`tikaf in the last ten nights of Ramadan and used to say, "Look for the Night of Qadr in the last ten nights of the month of Ramadan."
Reference: Sahih al-Bukhari 2020
In-book reference: Book 32, Hadith 7
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 32, Hadith 237