Sahih al-Bukhari 57
صحيح البخاري#57SahihNarrated Jarir bin Abdullah: I gave the pledge of allegiance to Allah's Messenger (ﷺ) for the following: 1. offer prayers perfectly 2. pay the Zakat (obligatory charity) 3. and be sincere and true to every Muslim
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: 2:50