Sahih al-Bukhari 2833
صحيح البخاري#2833SahihNarrated Salim Abu-An-Nadr:`Abdullah bin Abi `Aufa wrote and I read what he wrote that Allah's Messenger (ﷺ) said, "When you face them ( i.e. your enemy) then be patient
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: 56:49