(45) باب الأَمْرِ بِالْقِيَامِ لِلْجَنَازَةِ
It was narrated from 'Amir bin Rabi'ah that the Prophet said:
"When any one of you sees a funeral and is not walking with it, let him stand up until it has passed him, or until (the body) is placed (in the grave) before if passes him."
Reference: Sunan an-Nasa'i 1915
In-book reference: Book 21, Hadith 98
English translation: Vol. 3, Book 21, Hadith 1916