Mishkat al-Masabih #1445

He reported God’s messenger as saying, “A Muslim has six duties towards another Muslim.” When asked what they were he replied, “When you meet him salute him ; when he issues an invitation to you, accept it; when he asks your advice give it to him ; when he sneezes and praises God say, ‘God have mercy on you’; when he is ill visit him ; and when he dies follow him to the grave.” Muslim transmitted it.