Sahih al-Bukhari 481
صحيح البخاري#481SahihNarrated Abu Musa:The Prophet (ﷺ) said, "A faithful believer to a faithful believer is like the bricks of a wall, enforcing each other." While (saying that) the Prophet (ﷺ) clasped his hands, by interlacing his fingers
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: 8:128