Abu Dawud Book 35, Hadith Number 4631.

Narated By Sa’id ibn Zayd ibn Amr ibn Nufayl : Abdullah ibn Zalim al-Mazini said: I heard Sa’id ibn Zayd ibn Amr ibn Nufayl say: When so and so came to Kufah, and made so and so stand to address the people, Sa’id ibn Zayd caught hold of my hand and said: Are you seeing this tyrant? I bear witness to the nine people that they will go to Paradise. If I testify to the tenth too, I shall not be sinful.

I asked: Who are the nine? He said: The Apostle of Allah (PBUH) 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 Apostle of Allah, AbuBakr, Umar, Uthman, Ali, Talhah, az-Zubayr, Sa’d ibn AbuWaqqas and AbdurRahman ibn Awf. I asked: Who is the tenth? He paused a moment and said: it is I.