Once, the mention of the Khawarij was made in the presence of Sayyiduna Ali (may Allah be pleased with him), so he said: Among them there will be a man who is deformed in creation. If you do not go to extremes, I will tell you the promise that Allah has made, through the tongue of the Prophet (peace and blessings be upon him), to those who kill them. The narrator says: I asked him, "Did you really hear any statement from the Prophet (peace and blessings be upon him) regarding this?" So he replied three times: Yes! By the Lord of the Ka'bah.