Musnad Ahmad 27:1296

Hussain ibn Muhammad narrated to us, Shu'bah narrated to us, from Abu Yunus Hatim ibn Muslim, who said: I heard a man from Quraysh saying: I saw a woman who came to Ibn Umar in Mina wearing a silk garment. She said: "What do you say regarding silk?" He replied: "The Messenger of Allah, may Allah bless him and grant him peace, forbade it."