"Umar had made a vow to spend a night in 'Itikaf in Al-Masjid Al-Haram. He asked the Messenger of Allah about that, and he ordered him to perform the 'Itikaf."
Reference: Sunan an-Nasa'i 3821 In-book : Book 35, Hadith 61 English translation : Vol. 4, Book 35, Hadith 3852
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