Musnad Ahmad 5:148

Ya'qub narrated to us, my father narrated to us, from Ibn Ishaq, Ibrahim ibn Abdullah ibn Hunayn narrated to me, from his father, who said: I heard Ali ibn Abi Talib saying: The Messenger of Allah (peace and blessings of Allah be upon him) forbade me—I do not say he forbade you—from wearing a gold ring, from wearing *al-qassi* (silk-blend garments), from [wearing] saffron-dyed garments, and from reciting the Quran while I am bowing. He clothed me in a garment of *sira* (silk), so I went out in it. He said: "O Ali, I did not clothe you in it so that you would wear it." He said: So I returned with it to Fatimah and gave it to her. She took it to fold it with me, so I tore it into two pieces. He said: She said: "May your hands be covered in dust, O son of Abu Talib! What have you done?" He said: I said to her: "The Messenger of Allah (peace and blessings of Allah be upon him) forbade me from wearing it, so wear it and clothe your women with it."