Shayban ibn Farrukh narrated to us: Mahdi ibn Maymun narrated to us: Muhammad ibn Abdullah ibn Abi Ya'qub narrated to us, from al-Hasan ibn Sa'd, the freed slave of al-Hasan ibn Ali, from Abdullah ibn Ja'far, who said: The Messenger of Allah, peace and blessings be upon him, seated me behind him on his mount one day, and he confided to me a matter that I do not relate to anyone among the people.