Musnad Ahmad 30:1324

'Abd al-Samad narrated to us, Salim Abu Jami' narrated to us, Muhammad ibn Sirin narrated to us, that Abu Hurayrah narrated that 'Umar said: "O Messenger of Allah, 'Utarid al-Tamimi is offering a garment of silk, so if you were to buy it and wear it when the delegations of people come to you." He said: "Indeed, the one who wears silk is the one who has no share [in the Hereafter]."