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

[AI] The Messenger of Allah ﷺ forbade building or plastering over the grave.

نَهَى رَسُولُ اللهِ ﷺ أَنْ يُبْنَى عَلَى الْقَبْرِ أَوْ يُجَصَّصَ

"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»