And as for the hadith of al-Hasan bin Ubaydullah, it was narrated from him by Abu Bakr bin Ayyash; all of these narrators said: "from Zadhan, from al-Bara', from the Prophet (peace and blessings be upon him)." All of these chains that I have mentioned are sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim).

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) and Sayyiduna Bilal (may Allah be pleased with him) were walking in al-Baqi' (graveyard), when the Messenger of Allah (peace and blessings be upon him) said: "O Bilal! Do you hear what I hear?" He said: "No, by Allah, O Messenger of Allah! I do not hear it." He (peace and blessings be upon him) said: "Do you not hear the people of the graves being punished?" This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it with this wording; they only agreed on the hadith of Shu'bah from Qatadah from Anas, in which the Prophet (peace and blessings be upon him) said: "Were it not that I fear you would stop burying (your dead out of fear), I would ask Allah to make you hear the punishment of the grave."