It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: A Muslim has six rights over another Muslim in the form of goodness: when he meets him, he should greet him with Salam; when he sneezes, he should say "Yarhamukallah" (may Allah have mercy on you); when he falls ill, he should visit him; when he invites him, he should accept; when he passes away, he should participate in his funeral prayer; whatever he likes for himself, he should like for him as well, and in his absence, he should wish well for him.