Musannaf Ibn Abi Shayba 27:433

Narrated to us Sharik, from Abu Ishaq, from Hubashi ibn Junada, who said: I said to him, "O Abu Ishaq, where did you see him?" He said: "He stood over us in our gathering and said: 'I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: Ali is from me and I am from him, and no one shall discharge [a duty] on my behalf except Ali.'"