Musnad Abu Ya'la al-Mawsili 3:345

Zuhayr narrated to us, Ishaq bin Yusuf al-Azraq narrated to us, Zakariya narrated to us, from Abu Ishaq, from Hubayrah bin Yarim, from Ali, who said: The Messenger of Allah (may Allah bless him and grant him peace) forbade the gold ring, the Qassi (garments containing silk), and the red Mayathir (saddle cushions).