أَخْبَرَنَا يَحْيَى بْنُ دُرُسْتَ، قَالَ حَدَّثَنَا أَبُو إِسْمَاعِيلَ، عَنْ يَحْيَى، أَنَّ أَبَا سَلَمَةَ، حَدَّثَهُ عَنْ أَبِي سَعِيدٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا مَرَّتْ بِكُمْ جَنَازَةٌ فَقُومُوا فَمَنْ تَبِعَهَا فَلاَ يَقْعُدْ حَتَّى تُوضَعَ " .
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)." Translation Not Available
Book Ref: Sunan An Nisai Book 21 Hadith 1914
Web Ref: Sunan An Nisai Vol 3 Book 21 Hadith 1915