Sahih al-Bukhari 561
صحيح البخاري#561SahihNarrated Salama:We used to pray the Maghrib prayer with the Prophet (ﷺ) when the sun disappeared from the horizon
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: 9:38