Narrated Ibn `Umar: that `Umar had vowed in the Pre-Islamic period to perform I`tikaf in Al-Masjid-al-Haram. (A subnarrator thinks that `Umar vowed to perform I`tikaf for one night.) Allah's Apostle said to `Umar, "Fulfill your vow."
Hadith Referenceصحيح البخاري / كتاب الاعتكاف / 2043
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة