Ash Shuʿbi 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 ʿAmr! who narrated (that) to you"? He said, "Ibn ʿAbbas. "
أَخْبَرَنِي مَنْ شَهِدَ النَّبِيَّ ﷺ أَنَّهُ أَتَى عَلَى قَبْرٍ مَنْبُوذٍ فَصَفَّهُمْ وَكَبَّرَ أَرْبَعًا قُلْتُ مَنْ حَدَّثَكَ قَالَ ابْنُ عَبَّاسٍ ؓ