Himman (may Allah have mercy on him) said: Mu'awiyah (may Allah be pleased with him) performed Hajj and called a group of the Ansar, then said: "I adjure you by Allah, do you not know that the Messenger of Allah (peace and blessings be upon him) forbade gold?" They said: By Allah, yes. He said: "And I too bear witness." He said: "I adjure you by Allah, did you not hear the Messenger of Allah (peace and blessings be upon him) forbid saddle cushions of silk?" They said: By Allah, yes. He said: "I adjure you by Allah, did you not hear the Messenger of Allah (peace and blessings be upon him) forbid saddle cushions of leopard skin?" They said: By Allah, yes. He said: "And I too bear witness."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16879