I bear witness that nine of them are in Paradise, and if I bore witness for the tenth, I would not be sinning.Someone asked, "How is that?"He replied, "We were with the Messenger of Allah ﷺ at Mount Hira when he said, 'Be still, Hira, for there is none upon you except a prophet, a truthful one, or a martyr.'"He was asked, "And who were they?"He answered, "The Messenger of Allah ﷺ, Abu Bakr and Umar, Uthman, Ali, Talha, Zubayr, Saad, and Abdul-Rahman bin Awf."He was asked, "And who is the tenth?"He said, "I am."
حدثنا أحمد بن منيع حدثنا هشيم أخبرنا حصين عن هلال بن يساف عن عبد الله بن ظالم المازني
أشهد على التسعة أنهم في الجنة ولو شهدت على العاشر لم آثم قيل وكيف ذلك قال كنا مع رسول الله ﷺ بحراء فقال اثبت حراء فإنه ليس عليك إلا نبي أو صديق أو شهيد قيل ومن هم قال رسول الله ﷺ وأبو بكر وعمر وعثمان وعلي وطلحة والزبير وسعد وعبد الرحمن بن عوف قيل فمن العاشر قال أنا
[Its chain of transmission is hasan] Abu Dawud narrated it in the Book of Sunnah, chapter on the Caliphs, no. 4648, and Ibn Majah, no. 134, from the hadith of Husayn through the same route, and Ibn Hibban graded it sahih in al-Ihsan, no. 6957.