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 Iʿtikaf for ten days every year (in the month of Ramadan), but in the year of his death, he stayed in Iʿtikaf for twenty days.
كَانَ يَعْرِضُ عَلَى النَّبِيِّ ﷺ الْقُرْآنَ كُلَّ عَامٍ مَرَّةً فَعَرَضَ عَلَيْهِ مَرَّتَيْنِ فِي الْعَامِ الَّذِي قُبِضَ وَكَانَ يَعْتَكِفُ كُلَّ عَامٍ عَشْرًا فَاعْتَكَفَ عِشْرِينَ فِي الْعَامِ الَّذِي قُبِضَ {فِيهِ}