Sahih al-Bukhari 1276
In-book no 1276حَدَّثَنَا مُسْلِمٌ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا الشَّيْبَانِيُّ، عَنِ الشَّعْبِيِّ، قَالَ أَخْبَرَنِي مَنْ، شَهِدَ النَّبِيَّ صلى الله عليه وسلم أَنَّهُ أَتَى عَلَى قَبْرٍ مَنْبُوذٍ فَصَفَّهُمْ وَكَبَّرَ أَرْبَعًا. قُلْتُ مَنْ حَدَّثَكَ قَالَ ابْنُ عَبَّاسٍ 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. "