Sayyiduna Hudhayfah (may Allah be pleased with him) narrates: I heard the Prophet (peace and blessings be upon him) say: "There will be a man in my Ummah who will speak after death." (Allamah al-Haythami says:) I say: Before this, the hadith narrated by Sayyiduna al-Nu'man bin Bashir (may Allah be pleased with him) has already passed, which concerns the caliphate of the four Caliphs and concerns the man who spoke after death.