Musnad Ahmad 25:621

Abu Ahmad narrated to us, Sufyan narrated to us, from Abdullah ibn Uthman, from Sa'id ibn Jubayr, from Ibn Abbas, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "The best of your kohl is antimony (ithmid) at the time of sleep; it makes the hair grow and clears the vision. And the best of your garments is white; so wear them, and shroud your dead in them."