It was narrated from Abu Sa'eed that the Messenger of Allah said:"When a funeral passes by you, stand up, and whoever follows it, let him not sit down until it is put down (in the grave)
Hadith No. 1914
Sunan an Nasai
Gradings:
Abu Ghuddah:
Sahih
Al-Albani:
Sahih
Zubair Ali Zai:
Sahih - Agreed Upon