A person visited his brother in another town and Allah deputed an Angel to wait for him on his way and when he came to him he said: Where do you intend to go? He said: I intend to go to my brother in this town. He said: Have you done any favour to him (the repayment of which you intend to get)? He said: No, excepting this that I love Mm for the sake of Allah, the Exalted and Glorious. Thereupon he said: I am a meesenger to you from, Allah: (to inform you) that Allah loves you as you love him (for His sake).
He who visits the sick is supposed to remain in the fruit garden of Paradise. It was said: Allah's Messenger, what is this Khurfat-ul-jannah? He said: It is a place abounding in fruits.
Verily, Allah, the Exalted and Glorious, would say on the Day of Resurrection: O son of Adam, I was sick but you did not visit Me. He would say: O my Lord; how could I visit Thee whereas Thou art the Lord of the worlds? Thereupon He would say: Didn't you know that such and such servant of Mine was sick but you did not visit him and were you not aware of this that if you had visited him, you would have found Me by him? O son of Adam, I asked food from you but you did not feed Me. He would say: My Lord, how could I feed Thee whereas Thou art the Lord of the worlds? He said: Didn't you know that such and such servant of Mine asked food from you but you did not feed him, and were you not aware that if you had fed him you would have found him by My side? (The Lord would again say: ) O son of Adam, I asked drink from you but you did not provide Me. He would say: My Lord, how could I provide Thee whereas Thou art the Lord of the worlds? Thereupon He would say: Such and such of servant of Mine asked you for a drink but you did not provide him, and had you provided him drink you would have found him near Me.
'A'isha reported, I did not see anyone else being afflicted with more severe illness than Allah's Messenger (ﷺ). In the narration transmitted by 'Uthman there is a slight variation of wording.