Sahih al-Bukhari 1340
صحيح البخاري#1340SahihNarrated Ibn `Abbas:The Prophet (ﷺ) offered the funeral prayer of a man one night after he was buried, he and his companions stood up (for the Prayer). He had asked them about him before standing, saying, "Who is this?" They said, "He is so and so and was buried last night." So all of them offered the funeral prayer
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: 23:95