Musnad Abu Ya'la al-Mawsili 3:12

Zuhayr narrated to us, Yazid bin Harun narrated to us, Muhammad bin Ishaq narrated to us, from Yazid bin Abi Habib, from Abd al-Aziz bin Abi al-Sa'bah, from Abu Aflah al-Hamdani, from Abdullah bin Zurayr al-Ghafiqi, who said: Ali said: The Messenger of Allah (ﷺ) came out to us with gold in one of his hands and silk in the other. He said: "These two are forbidden for the males of my nation."