Maliks Muwatta Book 3, Hadith Number 29.

Yahya related to me from Malik from Nafi from Ibrahim ibn Abdullah ibn Hunayn from his father from Ali ibn Abi Talib that the Messenger of Allah, may Allah bless him and grant him peace, forbade wearing the qassi (an Egyptian garment, striped with silk),wearing gold rings, and reciting the Qur’an in ruku.