It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever goes to visit a sick person, it is as if he is walking in the gardens of Paradise. When he sits by the sick person, he immerses himself in the ocean of Allah's mercy, and when he returns from there, seventy thousand angels are appointed for him who continue to pray for his forgiveness that day."