Bulugh al-Maram, Book 3, Hadith 604 (English) ⓘ
Jabir (RAA) narrated that the Messenger of Allah prohibited whitening a grave with plaster, to sit on it or to build over it (such as a dome).’ Related by Muslim.
وَلِمُسْلِمٍ عَنْهُ: { نَهَى رَسُولُ اَللَّهِ - صلى الله عليه وسلم -أَنْ يُجَصَّصَ الْقَبْرُ, وَأَنْ يُقْعَدَ عَلَيْهِ, وَأَنْ يُبْنَى عَلَيْهِ } 1. 1 - صحيح. رواه مسلم (970).
also referenced under: Book 3, Hadith 48 (In-Book)