Chapter 66: Virtues of the Qur'an
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.
Sahih al-Bukhari 4998