Abu Tha'labah said: I met the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah, entrust me to a man who teaches well. So he (peace and blessings be upon him) entrusted me to Abu Ubaydah bin al-Jarrah, then said: "I have entrusted you to a man who will teach you and train you well." So I came to Abu Ubaydah bin al-Jarrah while he and Bashir bin Sa'd, the father of al-Nu'man bin Bashir, were talking; when they saw me, they fell silent. So I said: O Abu Ubaydah, by Allah, this is not what the Messenger of Allah (peace and blessings be upon him) told me (about you). He said: You came while we were narrating a hadith that we heard from the Messenger of Allah (peace and blessings be upon him); sit down so that we may narrate it to you as well. Then he said: The Messenger of Allah (peace and blessings be upon him) said: "Prophethood is among you, then there will be a caliphate on the method of Prophethood, then it will become kingship and tyranny."
Those named Usamah: Usamah bin Zayd bin Harithah, the beloved of the Messenger of Allah (peace and blessings be upon him); his kunyah was Abu Muhammad, and it is also said Abu Zayd.
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 365