Sahih al-Bukhari 5278
صحيح البخاري#5278SahihNarrated Al-Miswar bin Makhrama Az-Zuhri:I heard the Prophet (ﷺ) saying, "Banu Al-Mughira have asked my leave to let `Ali marry their daughter, but I give no leave to this effect
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: 68:27