Musnad Abu Ya'la al-Mawsili 167:11

Ishaq ibn Abi Isra'il narrated to us, Hammad ibn Zayd narrated to us, from Thabit, who said: I heard Abdullah ibn al-Zubayr while he was delivering a sermon, he said: Muhammad, peace be upon him, said: "Whoever wears silk in the world shall not wear it in the Hereafter."