Musnad Ahmad 27:319

Waki' narrated to us, 'Uyaynah ibn 'Abd al-Rahman narrated to me, from 'Ali ibn Zayd ibn Jud'an, Salim narrated to me, from his father, that the Prophet (peace and blessings of Allah be upon him) said: "Indeed, the one who wears silk is the one who has no share [in the Hereafter]."