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." (Using translation from Nasāʾī 5153)
أَنَّ مُعَاوِيَةَ عَامَ حَجَّ جَمَعَ نَفَرًا مِنْ أَصْحَابِ رَسُولِ اللهِ ﷺ فِي الْكَعْبَةِ فَقَالَ لَهُمْ «أَنْشُدُكُمُ اللهَ هَلْ نَهَى رَسُولُ اللهِ ﷺ عَنْ لُبْسِ الذَّهَبِ؟» قَالُوا نَعَمْ قَالَ «فَأَنَا أَشْهَدُ» خَالَفَهُ حَرْبُ بْنُ شَدَّادٍ رَوَاهُ عَنْ يَحْيَى عَنْ أَبِي شَيْخٍ عَنْ أَخِيهِ حِمَّانَ