Sahih Muslim Book 4, Hadith Number 2112.

Chapter : Niche in the grave and setting up of mud bricks over the dead.

‘Amir b. Sa’d b. Abu Waqqas told that Sa’d b. Abu Waqqas said during his illness of which he died: “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 (may peace be upon him).