Musnad Ahmad 284:20

Yunus and ‘Affan narrated to us, they said: Hammad bin Zayd narrated to us. ‘Affan said in his narration: Thabit al-Bunani narrated to us. Yunus said: From Thabit, he said: I heard Ibn al-Zubayr—‘Affan said: addressing us, and Yunus said: while he was addressing—saying: Muhammad, may Allah bless him and grant him peace, said: "Whoever wears silk in the world shall not wear it in the Hereafter."