Musnad Ahmad

It was narrated that Zaid bin Wahb said: `Ali (رضي الله عنه) came to some of the people of Basrah who were Khawarij, among whom was a man called Al-Ja’d bin Ba’jah. He said to him: Fear Allah, O ‘Ali, for you are going to die `Ali (رضي الله عنه) said: Rather I am going to be killed by a blow on this that will soak this – meaning his beard [would be soaked by blood from his head), a certain covenant and divine decree, And surely, he who invents a lie (against Allah) will fail miserably (cf 20:61). Then (the man) criticised `Ali for the way he was dressed. He said: What does the way I am dressed have to do with you? It is furthest removed from arrogance and it is more appropriate for the Muslim to follow my example.