(7) باب كَانَ جِبْرِيلُ يَعْرِضُ الْقُرْآنَ عَلَى النَّبِيِّ صلى الله عليه وسلم
Narrated Abu-Huraira:
Gabriel used to repeat the recitation of the Qur'an with the Prophet (ﷺ) once a year, but he repeated it twice with him in the year he died. The Prophet (ﷺ) used to stay in I`tikaf for ten days every year (in the month of Ramadan), but in the year of his death, he stayed in I`tikaf for twenty days.
Reference: Sahih al-Bukhari 4998
In-book reference: Book 66, Hadith 20
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 6, Book 61, Hadith 520