Narrated Abu Sa`id Al-Khudri: The Prophet said, "When you see a funeral procession, you should stand up, and whoever accompanies it should not sit till the coffin is put down."
Hadith ReferenceSahih Bukhari / The Book of Al-Janaiz (Funerals) / Hadith: 1310
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة