It is narrated from Sayyiduna Ali (may Allah be pleased with him) that when the Khawarij were mentioned, he said: Among them there will be a man with a defective hand. If I did not fear that you would fall into pride and arrogance, I would have told you what Allah Almighty has promised, through the tongue of Muhammad (peace and blessings be upon him), for those who kill these Khawarij. I said: Did you really hear this from Muhammad (peace and blessings be upon him)? He replied: Yes, by the Lord of the Ka'bah! Yes, by the Lord of the Ka'bah! Yes, by the Lord of the Ka'bah!