Messenger of Allah ﷺ 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 fulfill 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).  

أَمَرَنَا النَّبِيُّ ﷺ 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  

I heard Messenger of Allah ﷺ saying, "The rights of a Muslim on the Muslims are five: to respond to the salaam, visiting the sick, to follow the funeral processions, to accept an invitation, and to reply to those who sneeze. (see Hadith 1239)  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ حَقُّ الْمُسْلِمِ عَلَى الْمُسْلِمِ خَمْسٌ رَدُّ السَّلاَمِ وَعِيَادَةُ الْمَرِيضِ وَاتِّبَاعُ الْجَنَائِزِ وَإِجَابَةُ الدَّعْوَةِ وَتَشْمِيتُ الْعَاطِسِ