Sahih al-Bukhari 6987
صحيح البخاري#6987SahihNarrated 'Ubada bin As-Samit:The Prophet (ﷺ) said, "The (good) dreams of a faithful believer is a part of the forty-six parts of prophetism:
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: 91:6