Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) commanded us seven things and forbade us seven things: he commanded "visiting the sick, attending funerals, returning the greeting of salam, accepting invitations, fulfilling oaths, responding to one who sneezes, and helping the oppressed"; and he forbade "wearing a gold ring, drinking from silver vessels, wearing every kind of silk, sitting on silk cushions, and using red silk saddle-cloths."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5846