Musnad Abu Ya'la al-Mawsili 3:277

Abu Musa al-Zaman narrated to us, Yahya bin Sa'id narrated to us, from Ibn 'Ajlan, Ibrahim bin 'Abdullah bin Hunayn narrated to me, from his father, from Ibn 'Abbas, who said: 'Ali said: The Messenger of Allah (ﷺ) forbade me from a gold ring, and from reciting while I am bowing, and from [wearing] silk-blend garments (al-Qassi), and [from wearing] saffron-dyed garments.