Sahih al-Bukhari 1310
صحيح البخاري#1310SahihNarrated Abu Sa`id Al-Khudri:The Prophet (ﷺ) said, "When you see a funeral procession, you should stand up, and whoever accompanies it should not sit till the coffin 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: 23:68