Before the Battle of the Camel, he sent Ibn Abbas to Zubayr to advise him back to obedience

When before the commencement of the Battle of Jamal Amīr al-mu’minīn sent ‘Abdullāh ibn al-‘Abbās to az-Zubayr ibn al- ‘Awwām with the purpose that he should advise him back to obedience, he said to him on that occasion:

Do not meet Ṭalḥah (ibn ‘Ubaydillah). If you meet him you will find him like an unruly bull whose horns are turned towards its ears. He rides a ferocious riding beast and says it has been tamed. But you meet az-Zubayr because he is soft-tempered. Tell him that your maternal cousin says that, “(It looks as if) in the Hijāz you knew me (accepted me), but (on coming here to) Iraq you do not know me (do not accept me). So, what has dissuaded (you) from what was shown (by you previously)?!”