Musnad Abu Ya'la al-Mawsili 3:334

Zuhayr narrated to us, Jarir narrated to us, from Mughirah, from Umm Musa, who said: The killer of al-Zubayr sought permission to enter upon Ali. He said: "Let him enter the Fire. I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: 'Every prophet has a disciple (hawari), and my disciple is al-Zubayr.'"