Hadith 6:1241
Ubaydah ibn Humayd narrated to us, from Abd al-Malik ibn Umayr, from Mus'ab ibn Sa'd, from Sa'd: That he said to his sons, "O my sons, seek refuge in Allah with words that the Messenger of Allah (peace and blessings of Allah be upon him) used to seek refuge with." Then he mentioned the punishment of the grave.
حدثنا عبيدة بن حميد عن عبد الملك بن عمير عن مصعب بن سعد عن سعد أنه قال لبنيه يا بني تعوذوا بالله بكلمات كان رسول الله صلى الله عليه وسلم يتعوذ بهن فذكر عذاب القبر