Sahih al-Bukhari 4320
صحيح البخاري#4320SahihNarrated Ibn `Umar:When we returned from (the battle of) Hunain, `Umar asked the Prophet (ﷺ) about a vow which he had made during the Pre-Islamic period of Ignorance that he would perform I`tikaf. The Prophet (ﷺ) ordered him to fulfill his vow
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: 64:350