Sahih al-Bukhari 2042
صحيح البخاري#2042SahihNarrated `Abdullah bin `Umar:`Umar bin Al-Khattab said, "O Allah's Messenger (ﷺ)! I vowed in the Pre-Islamic period to perform I`tikaf in Al-Masjid-al-Haram for one night." The Prophet (ﷺ) said, "Fulfill your vow." So, he performed I`tikaf for one night
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 33:17