Riyad us-Salihin Hadith 239

The Prophet (ﷺ) commanded us to observe seven things and forbade us seven. He ordered us to visit the sick; to follow funeral processions; to respond to a sneezer with 'Yarhamuk-Allah (May Allah have mercy on you)' when he says 'Al-hamdu lillah (Praise be to Allah),' to help the oppressed and to help others to fulfill their oaths, to accept invitation and to promote greeting. He forbade us to wear gold rings, to drink in silver utensils, to use Mayathir (silk carpets placed on saddles), to wear Al-Qassiy (a kind of silk cloth), and to wear fine silk brocade. [Al-Bukhari and Muslim].