Muhammad bin Thwr al-Sn'any محمد بن ثور الصنعاني أبو عبد الله · The Book of Funerals

"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."'