Sahih Muslim 2162 b
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
Six are the rights of a Muslim over another Muslim. It was said to him: Allah's Messenger, what are these? Thereupon he said: When you meet him, offer him greetings;when he invites you to a feast accept it. when he seeks your council give him, and when he sneezes and says:" All praise is due to Allah," you say Yarhamuk Allah (may Allah show mercy to you) ; and when he fails ill visit him; and when he dies follow his bier.
حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ، وَقُتَيْبَةُ، وَابْنُ، حُجْرٍ قَالُوا حَدَّثَنَا إِسْمَاعِيلُ، - وَهُوَ ابْنُ
 جَعْفَرٍ - عَنِ الْعَلاَءِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ
 ‏"‏ حَقُّ الْمُسْلِمِ عَلَى الْمُسْلِمِ سِتٌّ ‏"‏ ‏.‏ قِيلَ مَا هُنَّ يَا رَسُولَ اللَّهِ قَالَ ‏"‏ إِذَا لَقِيتَهُ فَسَلِّمْ عَلَيْهِ
 وَإِذَا دَعَاكَ فَأَجِبْهُ وَإِذَا اسْتَنْصَحَكَ فَانْصَحْ لَهُ وَإِذَا عَطَسَ فَحَمِدَ اللَّهَ فَسَمِّتْهُ وَإِذَا مَرِضَ
 فَعُدْهُ وَإِذَا مَاتَ فَاتَّبِعْهُ ‏"‏ ‏.‏