Sahih al-Bukhari 3161
صحيح البخاري#3161SahihNarrated Abu Humaid As-Saidi:We accompanied the Prophet (ﷺ) in the Ghazwa of Tabuk and the king of 'Aila presented a white mule and a cloak as a gift to the Prophet. And the Prophet (ﷺ) wrote to him a peace treaty allowing him to keep authority over his country
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: 58:4