Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) forbade seven things and commanded seven: "Visiting the sick, offering the funeral prayer, responding to one who sneezes, spreading the greeting of salam, helping the oppressed, fulfilling the oath of one who swears, and accepting an invitation"; and he forbade seven: "Wearing gold rings, drinking from silver vessels, wearing silk, wearing thick silk brocade, wearing fine silk brocade, red silk saddle cushions and silk cushions."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأيمان / 19888