Sahih al-Bukhari · Hadith 1319
حدثنا مسلم، حدثنا شعبة، حدثنا الشيباني، عن الشعبي، قال اخبرني من، شهد النبي صلى الله عليه وسلم انه اتى على قبر منبوذ فصفهم وكبر اربعا. قلت من حدثك قال ابن عباس رضى الله عنهما
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