Thumama bin Shafi reported,

We were with Fadala bin Ubayd in the land of the Romans at Rhodes when one of our companions passed away. Fadala bin Ubayd ordered that his grave be leveled, then he said, "I heard the Messenger of Allah ﷺ commanding that graves be leveled."

Azami 3788

Sahih

عن ثمامة بن شفي قال

كنا مع فضالة بن عبيد بأرض الروم برودس، فتوفي صاحب لنا، فأمر فضالة بن عبيد بقبره فسوي ثم قال: سمعت رسول الله ﷺ يأمر بتسويتها.

الأعظمي 3788صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Funerals
Chapter
Graves
Section
Commanding the leveling of graves
Numbering
Jami al-Kamil 3788 (2nd edition)
Azami 3788