Messenger of Allah ﷺ forbade that the graves should be plastered or they be used as sitting places (for the people), or a building should be built over them.
نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يُجَصَّصَ الْقَبْرُ وَأَنْ يُقْعَدَ عَلَيْهِ وَأَنْ يُبْنَى عَلَيْهِ
I heard the Prophet ﷺ forbid to sit on the grave, to plaster it with gypsum, and to build any structure over it.
سَمِعْتُ رَسُولَ اللَّهِ ﷺ نَهَى أَنْ يُقْعَدَ عَلَى الْقَبْرِ وَأَنْ يُقَصَّصَ وَيُبْنَى عَلَيْهِ
"The Messenger of Allah prohibited plastering graves, writing on them, building over them, and treading on them."
نَهَى النَّبِيُّ ﷺ أَنْ تُجَصَّصَ الْقُبُورُ وَأَنْ يُكْتَبَ عَلَيْهَا وَأَنْ يُبْنَى عَلَيْهَا وَأَنْ تُوطَأَ
I heard the Prophet ﷺ forbid to sit on the grave, to plaster it with gypsum, and to build any structure over it. (Using translation from Abū Dāʾūd 3225)
سَمِعْتُ النَّبِيَّ ﷺ يَنْهَى أَنْ يُقْعَدَ عَلَى الْقَبْرِ وَأَنْ يُقَصَّصَ أَوْ يُبْنَى عَلَيْهِ
I heard the Prophet ﷺ forbid to sit on the grave, to plaster it with gypsum, and to build any structure over it. (Using translation from Abū Dāʾūd 3225)
سَمِعْتُ رَسُولَ اللهِ ﷺ يَنْهَى أَنْ يَقْعُدَ الرَّجُلُ عَلَى الْقَبْرِ وَأَنْ يُجَصَّصَ أَوْ أَنْ يُبْنَى عَلَيْهِ
"The Messenger of Allah forbade plastering over graves." (Using translation from Nasāʾī 2029)
نَهَى رَسُولُ اللهِ ﷺ أَنْ تُجَصَّصَ الْقُبُورُ أَوْ يُبْنَى عَلَيْهَا
[Machine] The Messenger of Allah ﷺ forbade building or plastering over the grave.
نَهَى رَسُولُ اللهِ ﷺ أَنْ يُبْنَى عَلَى الْقَبْرِ أَوْ يُجَصَّصَ
[Machine] The Prophet ﷺ forbade that a grave be elevated or sat upon. My father said, "There is no Umm Salamah in it."
أَنَّ النَّبِيَّ ﷺ نَهَى أَنْ يُجَصَّصَ قَبْرٌ أَنْ يُبْنَى عَلَيْهِ أَوْ يُجْلَسَ عَلَيْهِ قَالَ أَبِي لَيْسَ فِيهِ أُمُّ سَلَمَةَ
"The Messenger of Allah forbade building over graves, making them larger or plastering over them." (One of two narrators) Sulaiman bin Musa added: "Or writing on them." (Using translation from Nasāʾī 2027)
«نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يُبْنَى عَلَى الْقَبْرِ أَوْ يُجَصَّصَ أَوْ يَقْعُدَ عَلَيْهِ وَنَهَى أَنْ يُكْتَبَ عَلَيْهِ»