"I said:'O Messenger of Allah! I had vowed to perform I'tikaf in Al-Masjid Al-Haram for a night during the era of Jahiliyyah.' He said: 'Fulfill your vow.''"
Reference: Jami` at-Tirmidhi 1539 In-book : Book 20, Hadith 18 English translation : Vol. 2, Book 18, Hadith 1539
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