عَنْ أُمِّ سَلَمَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنْ يُبْنَى عَلَى الْقَبْرِ وَأَنْ يُجَصَّصَ
Sayyida Umm Salamah (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him and his family) forbade building structures over graves and plastering them with lime.