Ali bin Abu Talib (May Allah be pleased with him) reported:
I heard the Messenger of Allah (ﷺ) saying, “When a Muslim visits a sick Muslim at dawn, seventy thousand angels keep on praying for him till dusk. If he visits him in the evening, seventy thousand angels keep on praying for him till the morning; and he will have (his share of) reaped fruits in Jannah.”
Visiting a sick person is the sunnah of our beloved Messenger(SAW) and also the rewards are immense ! Even if it is your non-muslim friend who is sick visit him/her as the following hadith suggests that the Messenger of Allah (SAW) visited a jewish boy.
Anas (May Allah be pleased with him) reported:
A young Jewish boy who was in the service of the Prophet (ﷺ) fell ill. The Prophet (ﷺ) went to visit him. He sat down by his head and said to him, “Embrace Islam.” The little boy looked at his father who was sitting beside him. He said: “Obey Abul-Qasim (i.e., the Messenger of Allah (ﷺ)).” So he embraced Islam and the Prophet (ﷺ) stepped out saying, “Praise be to Allah Who has saved
him from Hell-fire.”
Keep following sunnah 🙂