Amir al-mu’minin was delivering a lecture from the pulpit of (the mosque of) Kufah when al-Ash`ath ibn Qays1 objected and said, “O’ Amir al-mu’minin this thing is not in your favour but against you.”2 Amir al-mu’minin looked at him with anger and said:

ومن كلام له (عليه السلام)
قاله للاشعث بن قيس وهو على منبر الكوفة يخطب
فمضى في بعض كلامه شيء اعترضه الاشعث، فقال: يا أميرالمؤمنين، هذه عليك لا لك، فخفض (عليه السلام) إليه بصره ثم قال:
How do you know what is for me and what is against me?! Curse of Allah and others be on you. You are a weaver and son of a weaver. You are the son of an unbeliever and yourself a hypocrite. You were arrested once by the Unbelievers and once by the Muslims, but your wealth and birth could not save you from either. The man who contrives for his own people to be put to sword and invites death and destruction for them does deserve that the near ones should hate him and the remote ones should not trust him.

ومَا يُدْرِيكَ مَا عَلَيَّ مِمَّا لِي؟ عَلَيْكَ لَعْنَةُ اللهِ وَلَعْنَةُ اللاَّعِنِينَ! حَائِكٌ ابْنُ حَائِك! مُنَافِقٌ ابْنُ كُافِر! وَاللهِ لَقَدْ أَسَرَكَ الكُفْرُ مَرَّةً وَالاسْلامُ أُخْرَى! فَمَا فَداكَ مِنْ وَاحِدَة مِنْهُمَا مَالُكَ وَلاَ حَسَبُكَ! وَإِنَّ امْرَأً دَلَّ عَلَى قَوْمِهِ السَّيْفَ، وَسَاقَ إِلَيْهِمُ الحَتْفَ، لَحَرِيٌّ أَنْ يَمقُتَهُ الاْقْرَبُ، وَلاَ يَأْمَنَهُ الاْبْعَدُ!
as-Sayyid ar-Radi says: This man was arrested once when an unbeliever and once in days of Islam. As for Amir al-mu’minin’s words that the man contrived for his own people to be put to sword, the reference herein is to the incident which occurred to al-Ash`ath ibn Qays in confrontation with Khalid ibn Walid at Yamamah, where he deceived his people and contrived a trick till Khalid attacked them. After this incident his people nicknamed him “`Urf an-Nar” which in the parlance stood for traitor.

قال السيد الشربف: يريد عليه السلام أنه أُسر في الكفر مرة وفي الاِسلام مرة . وأما قوله: «دل على قومه السيف»، فأراد به: حديثاً كان للاَشعث مع خالد بن الوليد باليمامة، غرّ فيه قومه ومكر بهم حتى أوقع بهم خالد، وكان قومه بعد ذلك يسمو نه «عُرْفَ النار»، وهو اسم للغادر عندهم.