I heard Ash-Shuʿbi saying, "A person who was accompanying the Prophet ﷺ passed by a grave that was separated from the other graves told me that the Prophet ﷺ once led the people in the (funeral) prayer and the people had aligned behind him. I said, "O Aba ʿAmr! Who told you about it?" He said, "Ibn ʿAbbas."
أَخْبَرَنِي مَنْ مَرَّ مَعَ النَّبِيِّ ﷺ عَلَى قَبْرٍ مَنْبُوذٍ فَأَمَّهُمْ وَصَفُّوا عَلَيْهِ فَقُلْتُ يَا أَبَا عَمْرٍو مَنْ حَدَّثَكَ فَقَالَ ابْنُ عَبَّاسٍ