I asked: Who are the nine? He said: The Messenger of Allah (ﷺ) said when he was on Hira': Be still, Hira', for only a Prophet, or an ever-truthful, or a martyr is on you. I asked: Who are those nine? He said: The Messenger of Allah, Abu Bakr, Umar, Uthman, Ali, Talhah, az-Zubayr, Sa'd ibn Abu Waqqas and AbdurRahman ibn Awf. I asked: Who is the tenth? He paused a moment and said: it is I.
Abu Dawud said: This tradition has been transmitted by al-Ashja'i, from Sufyan, from Mansur, from Hilal b. Yasaf, from Ibn Hayyan on the authority of 'Abd Allah b. Zalim through his different chain of narrators in a a similar manner.
In-book : Book 42, Hadith 53
English translation : Book 41, Hadith 4631