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."
Next: 3:260: Abu Huraira: The Prophet used to perform Itikaf every year in the month of Ramadan ...