Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 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).