"If a funeral passed by the Messenger of Allah he would stand up."
Sunan an-Nasa'i Book 21, Hadith 102
← Previous Hadith "We never saw the Messenger of Allah attend any funeral where he sat down until (the body) was placed (in the grave)."

Sunan an-Nasa'i Book 21, Hadith 101 Next Hadith → That they were sitting with the Messenger of Allah when a funeral appeared. The Messenger of Allah stood up, and those who were with him stood up, until it had passed by.

Sunan an-Nasa'i Book 21, Hadith 103