Retiring to a Mosque for Remembrance of Allah (I'tikaf)
Bukhari :: Book 3 :: Volume 33 :: Hadith 259
Narrated Ibn 'Umar:
that 'Umar had vowed in the Pre-lslamic period to perform Itikaf in Al-Masjid-al-Haram. (A sub-narrator thinks that 'Umar vowed to perform Itikaf for one night.) Allah's Apostle said to 'Umar, "Fulfill your vow."
Source materials are from the University of Southern California MSA site|
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