Zayd bin Wahb reported,

Ali came upon a group of the Khawarij from the people of Basra, among whom was a man called al-Jad bin Bajah. He said to him, "Fear Allah, Ali, for you will surely die."Ali replied, "Rather, I will be killed. A blow upon this," meaning his head, "will dye this," meaning his beard. "It is a promise already given and a decree already decreed, and whoever fabricates lies has surely failed."The man also reproached him concerning his clothing, so Ali said, "What have you to do with my clothing? It is further from arrogance and more fitting for a Muslim to follow my example."

حدثنا عبد الله حدثني علي بن حكيم الأودي أنبأنا شريك عن عثمان بن أبي زرعة

عن زيد بن وهب قال

قدم علي رضي الله عنه على قوم من أهل البصرة من الخوارج فيهم رجل يقال له الجعد بن بعجة فقال له اتق الله يا علي فإنك ميت فقال علي رضي الله عنه بل مقتول ضربة على هذا تخضب هذه يعني لحيته من رأسه عهد معهود وقضاء مقضي وقد خاب من افترى وعاتبه في لباسه فقال ما لكم وللباس هو أبعد من الكبر وأجدر أن يقتدي بي المسلم