´Ibn Himman said:` "Mu'awiyah went on Hajj and he called a group of Ansar to the Ka'bah. He said: 'Did you hear the Messenger of Allah [SAW] forbid gold?' They said: 'Yes.' He said: 'And I bear witness to that.'"
Hadith Referenceسنن نسائي / كتاب الزينة من السنن / 5160