Sunan An-Nasa'i

It was narrated from Abu Himman:That when Mu'awiyah went on Hajj, he gathered together a group of the Companions of the Messenger of Allah [SAW] at the Ka'bah and said to them: ""I adjure you by Allah, did the Messenger of Allah [SAW] forbid wearing gold?"" They said: ""Yes."" He said: ""And I bear witness to that