Mukhtasar Muslim

'Amir bin Sa'd narrates that (the conqueror of Persia, Sayyiduna) Sa'd bin Abi Waqqas (may Allah be pleased with him) said during his illness in which he passed away: "Make a lahd (niche in the grave) for me and place unbaked bricks over it, just as was done for the Messenger of Allah (peace and blessings be upon him)."