When his men were overpowered by Muawiya''s men
Nahj al-Balāgha|Volume 1|Book 1|Chapter 25
ثم قال (عليه السلام): أُنْبِئْتُ بُسْراً قَدِ اطَّلَعَ الَيمنَ، وَإِنِّي وَاللهِ لاَظُنُّ هؤُلاءِ القَوْمَ سَيُدَالُونَ مِنْكُمْ بِاجْتِماعِهمْ عَلَى بَاطِلِهمْ، وَتَفَرُّقِكُمْ عَنْ حَقِّكُمْ، وَبِمَعْصِيَتِكُمْ إِمَامَكُمْ في الحَقِّ، وَطَاعَتِهِمْ إِمَامَهُمْ في البَاطِلِ، وَبِأَدَائِهِمُ الاْمَانَةَ إِلَى صَاحِبِهِمْ وَخِيَانَتِكُمْ، وَبِصَلاَحِهمْ في بِلاَدِهِمْ وَفَسَادِكُمْ، فَلَو ائْتَمَنْتُ أَحَدَكُمْ عَلَى قَعْب لَخَشِيتُ أَنْ يَذْهَبَ بِعِلاَقَتِهِ.
Then he continued : I have been informed that Busr has overpowered Yemen. By Allāh, I have begun thinking about these people that they would shortly snatch away the whole country through their unity on their wrong and your disunity (from your own right), and separation, your disobedience of your Imam in matters of right and their obedience to their leader in matters of wrong, their fulfilment of the trust in favour of their master and your betrayal, their good work in their cities and your mischief. Even if I give you charge of a wooden bowl I fear you would run away with its handle.