Sahih Bukhari Volume 2, Book 23, Hadith 1240

حَدَّثَنَا أَبُو الْوَلِيدِ، حَدَّثَنَا شُعْبَةُ، عَنِ الأَشْعَثِ، قَالَ سَمِعْتُ مُعَاوِيَةَ بْنَ سُوَيْدِ بْنِ مُقَرِّنٍ، عَنِ الْبَرَاءِ ـ رضى الله عنه ـ قَالَ أَمَرَنَا النَّبِيُّ صلى الله عليه وسلم بِسَبْعٍ، وَنَهَانَا عَنْ سَبْعٍ أَمَرَنَا بِاتِّبَاعِ الْجَنَائِزِ، وَعِيَادَةِ الْمَرِيضِ، وَإِجَابَةِ الدَّاعِي، وَنَصْرِ الْمَظْلُومِ، وَإِبْرَارِ الْقَسَمِ، وَرَدِّ السَّلاَمِ، وَتَشْمِيتِ الْعَاطِسِ‏.‏ وَنَهَانَا عَنْ آنِيَةِ الْفِضَّةِ، وَخَاتَمِ الذَّهَبِ، وَالْحَرِيرِ، وَالدِّيبَاجِ، وَالْقَسِّيِّ، وَالإِسْتَبْرَقِ‏

Narrated By Al-Bara' bin 'Azib : Allah's Apostle ordered us to do seven things and forbade us to do other seven. He ordered us: to follow the funeral procession. to visit the sick, to accept invitations, to help the oppressed, to fulfil the oaths, to return the greeting and to reply to the sneezer: (saying, "May Allah be merciful on you," provided the sneezer says, "All the praises are for Allah,"). He forbade us to use silver utensils and dishes and to wear golden rings, silk (clothes), Dibaj (pure silk cloth), Qissi and Istabraq (two kinds of silk cloths).