Sunan an-Nasa'i, Book 21, Hadith 214 (In-Book) ⓘ

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 commanding that it be made level."'

أَخْبَرَنَا سُلَيْمَانُ بْنُ دَاوُدَ، قَالَ أَنْبَأَنَا ابْنُ وَهْبٍ، قَالَ أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ، أَنَّ ثُمَامَةَ بْنَ شُفَىٍّ، حَدَّثَهُ قَالَ ‏:‏ كُنَّا مَعَ فَضَالَةَ بْنِ عُبَيْدٍ بِأَرْضِ الرُّومِ فَتُوُفِّيَ صَاحِبٌ لَنَا، فَأَمَرَ فَضَالَةُ بِقَبْرِهِ فَسُوِّيَ، ثُمَّ قَالَ ‏:‏ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَأْمُرُ بِتَسْوِيَتِهَا ‏.‏