What did Gabriel (peace be upon him) do each year when he visited the Prophet Muhammad (peace be upon him)?
 Narrated Abu-Huraira:                     Gabriel used to repeat the recitation of the Qur'an with the Prophet once a year, but he repeated it twice with him in the year he died. The Prophet 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.