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Sahih Muslim Book 15, Hadith Number 4072.
Chapter : What a non-believer should do with his vow when he embraces Islam.
Ibn ‘Umar reported that Umar (b. Khattab) said: Messenger of Allah, I had taken a vow during the days of Ignorance (Jahiliyya) that I would observe I’tikaf for a night in the Sacred Mosque. He (the Holy Prophet) said: Fulfil your vow.