Ali (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him and his family) said: "A Muslim has six rights over another Muslim according to custom: When he meets him, he should greet him with salam; when he invites him, he should accept it; when he sneezes (and says 'Alhamdulillah'), he should say to him 'Yarhamuk Allah'; when he falls ill, he should visit him; when he dies, he should attend his funeral; and he should like for him what he likes for himself." Its chain is weak. Narrated by al-Tirmidhi and al-Darimi.