Musannaf Ibn Abi Shaybah 12413 — The punishment of the grave and what

It is narrated from Mus'ab bin Sa'd that Sayyiduna Sa'd (may Allah be pleased with him) said to his son: "O my son, seek refuge with Allah through the words with which the Prophet (peace and blessings be upon him) used to seek refuge." Then he mentioned the punishment of the grave.