Sahih al-Bukhari 6589
صحيح البخاري#6589SahihNarrated Jundab:I heard the Prophet, saying, "I am your predecessor at the Lake-Fount. (Al-Kauthar)
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: 81:177