Sahih Bukhari

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.""