Musnad Abu Ya'la al-Mawsili 3:344

Abu Khaythama narrated to us, Abu ‘Amir al-‘Aqadi narrated to us, Dawud ibn Qays narrated to us, Ibrahim ibn ‘Abd Allah ibn Hunayn narrated to me, from his father, from Ibn ‘Abbas, from ‘Ali, who said: My beloved (may Allah bless him and grant him peace) forbade me from three things—I do not say he forbade the people—from wearing gold rings, from wearing silk garments (al-Qassi), and from [wearing] red-dyed garments (al-mu‘asfar al-mufaddam), and that I recite [the Qur’an] while bowing or prostrating.