Musnad Ahmad 5:376

Abdullah narrated to us, Abu Dawud al-Mubaraki Sulayman ibn Muhammad narrated to us, Abu Shihab narrated to us, from Ibn Abi Layla, from Abd al-Karim, from Abdullah ibn al-Harith ibn Nawfal, from Ibn Abbas, from Ali, who said: "The Messenger of Allah, peace and blessings of Allah be upon him, forbade me from the gold ring, from wearing red, and from reciting [the Quran] while bowing and prostrating."