It is narrated from Sayyiduna Uhban bin Sayfi al-Ghifari (may Allah be pleased with him) that he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "If you see two men of my Ummah fighting each other over wealth, then at that time get a sword of wood ready."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 861