Musnad Ahmad 5:41

Abdullah narrated to us, Wahb ibn Baqiyyah al-Wasiti narrated to me, Umar ibn Yunus—meaning al-Yamami—narrated to us, from Abdullah ibn Umar al-Yamami, from al-Hasan ibn Zayd ibn Hasan, my father narrated to me, from his father, from Ali, who said: I was with the Prophet, may Allah bless him and grant him peace, and Abu Bakr and Umar approached. He said: "O Ali, these two are the masters of the middle-aged men of the people of Paradise, and its youth, after the prophets and the messengers."