An announcement about what took place in Siffin
Nahj al-Balāgha|Volume 1|Book 2|Chapter 58
فَمَنْ تَمَّ عَلَى ذلِكَ مِنْهُمْ فَهُوَ الَّذِي أَنْقَذَهُ اللهُ مِنَ الْهَلَكَةِ، وَمَنْ لَجَّ وَتَمَادَى فَهُوَ الرَّاكِسُ الَّذِي رَانَ اللهُ عَلَى قَلْبِهِ، وَصَارَتْ دَائِرَةُ السَّوْءِ عَلَى رَأْسِهِ.
Now, whoever among them adheres to this will be saved by Allāh from ruin, and whoever shows obstinacy and insistence (on wrong) is the reverser whose heart has been blinded by Allāh and evils will encircle his head.