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bayhaqi:6740Abū Zakariyyā b. Abū Isḥāq And Ghayruh > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > al-Rabīʿ > al-Shāfiʿī > Ibrāhīm b. Muḥammad > Jaʿfar b. Muḥammad from his father

[Machine] That the Prophet ﷺ sprinkled water on the grave of his son Ibrahim and placed pebbles on it. Al-Shafi'i said, "Pebbles only stick on a flat grave."  

البيهقي:٦٧٤٠وَأَخْبَرَنَا أَبُو زَكَرِيَّا بْنُ أَبِي إِسْحَاقَ وَغَيْرُهُ قَالُوا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ أنبأ الرَّبِيعُ أنبأ الشَّافِعِيُّ أنبأ إِبْرَاهِيمُ بْنُ مُحَمَّدٍ عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ عَنْ أَبِيهِ

أَنَّ النَّبِيَّ ﷺ رَشَّ عَلَى قَبْرِ إِبْرَاهِيمَ ابْنِهِ وَوَضَعَ عَلَيْهِ حَصْبَاءَ قَالَ الشَّافِعِيُّ وَالْحَصْبَاءُ لَا تَثْبُتُ إِلَّا عَلَى قَبْرٍ مُسَطَّحٍ