Sahih al-Bukhari — Funerals (Al-Janaa'iz) — Hadith No: 1319
Translation
Narrated Ash-Shaibani:Ash-Shu`bi said, "I was informed by a man who had seen the Prophet (ﷺ) going to a grave that was separate from the other graves and he aligned the people in rows and said four Takbir." I said, "O Abu `Amr! who narrated (that) to you"? He said, "Ibn `Abbas