Musnad Abu Ya'la al-Mawsili 5:1

Abu Yusuf Ya'qub ibn Ibrahim narrated to us, Abu 'Asim narrated to us, from 'Abdullah ibn Muhammad ibn 'Abd al-Malik ibn Muslim al-Raqashi, from his grandfather 'Abd al-Malik, from Abu Jarw al-Mazini, who said: I witnessed 'Ali and al-Zubayr when they stood facing one another. 'Ali said to him, "O Zubayr, I adjure you by Allah, did you hear the Messenger of Allah (may Allah bless him and grant him peace) say: 'You will fight me while you are the oppressor'?" He said, "Yes, and I had not remembered it except in this position of mine." Then he departed.