Hadith 1524

Abu Huraira reported God’s messenger as saying, “A Muslim has five duties towards another Muslim: to return a salutation, visit the sick, follow funerals, accept an invitation and say ‘God have mercy on you’ when one sneezes.” (Bukhari and Muslim.)

وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " حَقُّ الْمُسْلِمِ عَلَى الْمُسْلِمِ خَمْسٌ: رَدُّ السَّلَامِ وَعِيَادَةُ الْمَرِيضِ وَاتِّبَاعُ الْجَنَائِزِ وَإِجَابَةُ الدعْوَة وتشميت الْعَاطِس "

Reference: 5615240
In-book reference: Book 5, Hadith 1524