حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، عَنْ مُحَمَّدِ بْنِ عَمْرٍو، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ خَمْسٌ مِنْ حَقِّ الْمُسْلِمِ عَلَى الْمُسْلِمِ رَدُّ التَّحِيَّةِ وَإِجَابَةُ الدَّعْوَةِ وَشُهُودُ الْجِنَازَةِ وَعِيَادَةُ الْمَرِيضِ وَتَشْمِيتُ الْعَاطِسِ إِذَا حَمِدَ اللَّهَ ‏"‏ ‏.‏

It wasnarrated from Abu Hurairah that the Messenger of Allah (PBUH)said: “Five are the rights of the Muslim: Returning his greeting,accepting his invitation; attending his funeral; visiting the sich;and answering (saying Yarhamuk-Allah) to the one who sneezes, if hepraises Allah (says Al-Hamdu Lillah).” Translation Not Available

Book Ref: Sunan Ibn Majah Book 6 Hadith 1435
Web Ref:  Sunan Ibn Majah Vol 1 Book 6 Hadith 1435