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

Nahj al-Balāgha|Volume 1|Book 1|Chapter 31
Nahj al-Balāgha

Book 1, Chapter 31

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

قال السيد الشريف: وهو (عليه السلام) أوّل من سمعت منه هذه الكلمة، أعني: «فَمَا عَدَا مِمَّا بَدَا».
As-Sayyid ar-Raḍī says: The last sentence of this sermon “famā ‘adā mimmā badā” has been heard only from Amīr al-mu’minīn.