Answer:
The Prophet Muhammad ﷺ was lowered into the grave by Sayyidunā ʿAlī, Sayyidunā al-ʿAbbās, and Sayyidunā al-Faḍl ibn al-ʿAbbās رضي الله عنهم.
Narration of ʿAbdullāh ibn ʿAbbās رضي الله عنهما:
دَخَلَ قَبْرَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْعَبَّاسُ، وَعَلِيٌّ، وَالْفَضْلُ، وَسَوَّى لَحْدَهُ رَجُلٌ مِنَ الْأَنْصَارِ وَهُوَ الَّذِي سَوَّى لُحُودَ الشُّهَدَاءِ يَوْمَ بَدْرٍ
“Sayyidunā al-ʿAbbās ibn ʿAbd al-Muṭṭalib, Sayyidunā ʿAlī ibn Abī Ṭālib, and Sayyidunā al-Faḍl ibn al-ʿAbbās رضي الله عنهم descended into the grave of the Prophet ﷺ. A man from the Anṣār leveled the grave, and he was the same one who had prepared the graves of the martyrs of Badr.”
[Musnad Abī Yaʿlā: 4/396, Ḥadīth: 2518 | Sharḥ Maʿānī al-Āthār of al-Ṭaḥāwī: 4/47 | Musnad al-Bazzār: 855]
✔ The chain of narration is Hasan (good).
✔ This narration has been authenticated by Imām Ibn al-Jārūd (547) and Imām Ibn Ḥibbān (6633).
Additional Note:It is also established through this narration that the Prophet ﷺ was buried in a Lahd-style grave (a recess dug in the side of the grave).
The Prophet Muhammad ﷺ was lowered into the grave by Sayyidunā ʿAlī, Sayyidunā al-ʿAbbās, and Sayyidunā al-Faḍl ibn al-ʿAbbās رضي الله عنهم.
Narration of ʿAbdullāh ibn ʿAbbās رضي الله عنهما:
دَخَلَ قَبْرَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْعَبَّاسُ، وَعَلِيٌّ، وَالْفَضْلُ، وَسَوَّى لَحْدَهُ رَجُلٌ مِنَ الْأَنْصَارِ وَهُوَ الَّذِي سَوَّى لُحُودَ الشُّهَدَاءِ يَوْمَ بَدْرٍ
“Sayyidunā al-ʿAbbās ibn ʿAbd al-Muṭṭalib, Sayyidunā ʿAlī ibn Abī Ṭālib, and Sayyidunā al-Faḍl ibn al-ʿAbbās رضي الله عنهم descended into the grave of the Prophet ﷺ. A man from the Anṣār leveled the grave, and he was the same one who had prepared the graves of the martyrs of Badr.”
[Musnad Abī Yaʿlā: 4/396, Ḥadīth: 2518 | Sharḥ Maʿānī al-Āthār of al-Ṭaḥāwī: 4/47 | Musnad al-Bazzār: 855]
✔ The chain of narration is Hasan (good).
✔ This narration has been authenticated by Imām Ibn al-Jārūd (547) and Imām Ibn Ḥibbān (6633).
Additional Note:It is also established through this narration that the Prophet ﷺ was buried in a Lahd-style grave (a recess dug in the side of the grave).
