Musnad Ahmad 27:915

'Affan narrated to us, Hammam narrated to us, Qatadah narrated to us, Bakr ibn 'Abdullah and Bishr ibn 'A'idh al-Hudhali narrated to me, both of them from 'Abdullah ibn 'Umar, from the Prophet, may Allah bless him and grant him peace, who said: "Indeed, only he wears silk who has no share [in the Hereafter]."