Ibn 'Abbas said that a piece of red stuff was put in the grave of Allah's Messenger (ﷺ).
Sahih Muslim Book 11, Hadith 118
← Previous Hadith " Make a niche for me in the side of the grave and set up bricks over me as was done in case of Allah's Messenger (ﷺ).

Sahih Muslim Book 11, Hadith 117 Next Hadith → When we were with Fadala b. 'Ubaid in the country of the Romans at a place (known as) Rudis, a friend of ours died. Fadala b. 'Ubaid ordered to prepare a grave for him and then it was levelled; and then he said: I heard the Messenger of Allah (ﷺ) commanding (us) to level the grave.

Sahih Muslim Book 11, Hadith 119