The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 2112
'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).