(32) باب النَّهْىِ عَنْ تَجْصِيصِ الْقَبْرِ، وَالْبِنَاءِ، عَلَيْهِ
Jabir said:
Allah's Messenger (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.
Reference: Sahih Muslim 970 a
In-book reference: Book 11, Hadith 121
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 2116