What did The Prophet (saw) say when `Umar bin Al-Khattab expressed his intention to perform I'tikaf in Al-Masjid-al-Haram?
 Narrated `Abdullah bin `Umar:                     `Umar bin Al-Khattab said, "O Allah's Apostle! I vowed in the Pre-Islamic period to perform I`tikaf in Al-Masjid-al-Haram for one night." The Prophet said, "Fulfill your vow." So, he performed I`tikaf for one night.