Sayyiduna Sa’d bin Abi Waqqas (may Allah be pleased with him) stated in his final will that my grave should be made in the form of a lahd, and raw bricks should be placed over it, just as was done with the Prophet (peace and blessings be upon him).
Hadith Referenceمسند احمد / مسند باقي العشرة المبشرين بالجنة / 1602