Sahih al-Bukhari 1307
صحيح البخاري#1307SahihNarrated 'Amir bin Rabi`a:The Prophet (ﷺ) said, "Whenever you see a funeral procession, stand up till the procession goes ahead of you." Al-Humaidi added, "Till the coffin leaves you behind or is put down
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: 23:65