It is narrated from Sayyiduna Ali (may Allah be pleased with him), he says that I heard the Messenger of Allah (peace and blessings be upon him) say: Whoever among the Muslims visits his sick brother, Allah Almighty will send seventy thousand angels for him, who will pray for mercy for him. If he does this at any hour of the day, this supplication continues until evening, and if he visits at night, this supplication continues until morning.