Thumamah bin Shufa narrated:
"We were with Fadalah bin 'Ubaid in the land of the Romans, and a companion of ours died. Fadalah ordered that his grave be made level, then he said: 'I heard the Messenger of Allah (ﷺ) comma…
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ حَبِيبٍ، عَنْ أَبِي وَائِلٍ، عَنْ أَبِي الْهَيَّاجِ، قَالَ قَالَ عَلِيٌّ رضى الله عنه : أَلاَ أَبْعَثُكَ عَلَى مَا بَعَثَنِي عَلَيْهِ رَسُولُ اللَّهِ صلى الله عليه وسلم لاَ تَدَعَنَّ قَبْرًا مُشْرِفًا إِلاَّ سَوَّيْتَهُ، وَلاَ صُورَةً فِي بَيْتٍ إِلاَّ طَمَسْتَهَا …
'Ali said:
"Shall I not send you on the same mission as the Messenger of Allah (ﷺ) sent me? Do not leave any raised grave without leveling it, or any image in a house without erasing it."