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 صلی اللہ علیہ وآلہ وسلم commanding that it be made level.” (Sahih)