Sunan Ibn Majah
Sunan Ibn Majah 1561
حَدَّثَنَا الْعَبَّاسُ بْنُ جَعْفَرٍ، حَدَّثَنَا مُحَمَّدُ بْنُ أَيُّوبَ أَبُو هُرَيْرَةَ الْوَاسِطِيُّ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ، عَنْ كَثِيرِ بْنِ زَيْدٍ، عَنْ زَيْنَبَ بِنْتِ نُبَيْطٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ أَعْلَمَ قَبْرَ عُثْمَانَ بْنِ مَظْعُونٍ بِصَخْرَةٍ .
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Al-Abbas ibn Ja‘far narrated to us; Muhammad ibn Ayyub Abu Hurayrah al-Wasiti narrated to us; Abd al-Aziz ibn Muhammad narrated to us, from Kathir ibn Zayd, from Zaynab bint Nubayt, from Anas ibn Malik: ‘The Messenger of Allah (peace and blessings be upon him) marked Uthman ibn Maz‘un’s grave with a rock.’
Notes and open questions — unreviewed
The report says the grave was marked with a rock; it does not give additional detail about the marker.