It is narrated from Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "How will you be when you start killing one another?" The Companions said: Are we not killing one another today? He (peace and blessings be upon him) said: "That is not what I mean; rather, (what is meant is) the Muslims killing one another, and (at that time) people's minds will be taken away, until they begin to consider misguidance to be right guidance."
Imam al-Tabarani (may Allah have mercy on him) said: "Only al-Hiql (may Allah have mercy on him) narrated this hadith from Imam al-Awza'i (may Allah have mercy on him)."