It is narrated from Sayyiduna Khalid bin Urfutah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "O Khalid, there will soon be tribulation, new events, disagreement and division. When that happens, if you are able to be the one killed rather than the killer, then do so."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4084