Musnad Ahmad 493:8

Abu Ahmad narrated to us, Israel narrated to us, from Abu Ishaq, from Habashi ibn Junadah al-Saluli—and he had witnessed the Farewell Pilgrimage—who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Ali is from me and I am from him, and no one shall discharge [a duty] on my behalf except me or Ali."