Sahih Bukhari
Characteristics of Prayer
Volume: 001 / Book Number: 012 / Hadith Number: 816
Narrated Sulaiman Ash-Shaibam:
I heard Ash-Sha'bi saying, "A person who was accompanying the Prophet passed by a grave that was separated from the other graves told me that the Prophet once led the people in the (funeral) prayer and the people had aligned behind him. I said, "O Aba 'Amr! Who told you about it?" He said, "Ibn Abbas."