Chapter: The Itikaf at night.

Hadith Number 2032

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Narrated Ibn `Umar

`Umar asked the Prophet (ﷺ) "I vowed in the Pre-Islamic period of ignorance to stay in I`tikaf for one night in Al-Masjid al-Haram." The Prophet (ﷺ) said to him, "Fulfill your vow."