Abu Hurairah (RAA) narrated that the Messenger of Allah (ﷺ) said:

“A Muslim has six duties towards other Muslims: When you meet him, you should salute him; when he invites you, accept his invitation; when he asks for your advice, give it to him; when he sneezes and praises Allah, say May Allah have mercy on you; when he is ill, visit him; and when he dies follow his funeral.” Related by Muslim.

عَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ حَقُّ اَلْمُسْلِمِ عَلَى اَلْمُسْلِمِ سِتٌّ: إِذَا لَقِيتَهُ فَسَلِّمْ عَلَيْهِ, وَإِذَا دَعَاكَ فَأَجِبْهُ, وَإِذَا اِسْتَنْصَحَكَ فَانْصَحْهُ, وَإِذَا عَطَسَ فَحَمِدَ اَللَّهَ فَسَمِّتْهُ [1]‏ وَإِذَا مَرِضَ فَعُدْهُ, وَإِذَا مَاتَ فَاتْبَعْهُ } رَوَاهُ مُسْلِمٌ [2]‏ .‏