Musnad Ahmad 27:1645

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