The one who visits the sick is in fact like one who is in the fruit garden of Paradise so long as he does not return.  

أَبُو الرَّبِيعِ رَفَعَهُ إِلَى النَّبِيِّ ﷺ وَفِي حَدِيثِ سَعِيدٍ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ عَائِدُ الْمَرِيضِ فِي مَخْرَفَةِ الْجَنَّةِ حَتَّى يَرْجِعَ  

He who visits the sick continues to remain in the fruit garden of Paradise until he returns.  

عَنْ ثَوْبَانَ مَوْلَى رَسُولِ اللَّهِ ﷺ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ مَنْ عَادَ مَرِيضًا لَمْ يَزَلْ فِي خُرْفَةِ الْجَنَّةِ حَتَّى يَرْجِعَ  

Verily, when a Muslim visits his brother in Islam he is supposed to remain in the fruit garden of Paradise until he returns.  

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ الْمُسْلِمَ إِذَا عَادَ أَخَاهُ الْمُسْلِمَ لَمْ يَزَلْ فِي خُرْفَةِ الْجَنَّةِ حَتَّى يَرْجِعَ  

He who visits the sick is supposed to remain in the fruit garden of Paradise. It was said: Messenger of Allah, what is this Khurfat-ul-jannah? He said: It is a place abounding in fruits.  

عَنْ ثَوْبَانَ مَوْلَى رَسُولِ اللَّهِ ﷺ عَنْ رَسُولِ اللَّهِ ﷺ قَالَ مَنْ عَادَ مَرِيضًا لَمْ يَزَلْ فِي خُرْفَةِ الْجَنَّةِ قِيلَ يَا رَسُولَ اللَّهِ وَمَا خُرْفَةُ الْجَنَّةِ قَالَ جَنَاهَا  

This hadith has been narrated on the authority of Asim al-Ahwal with the same chain of transmitters.  

عَنْ عَاصِمٍ الأَحْوَلِ بِهَذَا الإِسْنَادِ  

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.  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ اللَّهَ ﷻ يَقُولُ يَوْمَ الْقِيَامَةِ يَا ابْنَ آدَمَ مَرِضْتُ فَلَمْ تَعُدْنِي قَالَ يَا رَبِّ كَيْفَ أَعُودُكَ وَأَنْتَ رَبُّ الْعَالَمِينَ قَالَ أَمَا عَلِمْتَ أَنَّ عَبْدِي فُلاَنًا مَرِضَ فَلَمْ تَعُدْهُ أَمَا عَلِمْتَ أَنَّكَ لَوْ عُدْتَهُ لَوَجَدْتَنِي عِنْدَهُ يَا ابْنَ آدَمَ اسْتَطْعَمْتُكَ فَلَمْ تُطْعِمْنِي قَالَ يَا رَبِّ وَكَيْفَ أُطْعِمُكَ وَأَنْتَ رَبُّ الْعَالَمِينَ قَالَ أَمَا عَلِمْتَ أَنَّهُ اسْتَطْعَمَكَ عَبْدِي فُلاَنٌ فَلَمْ تُطْعِمْهُ أَمَا عَلِمْتَ أَنَّكَ لَوْ أَطْعَمْتَهُ لَوَجَدْتَ ذَلِكَ عِنْدِي يَا ابْنَ آدَمَ اسْتَسْقَيْتُكَ فَلَمْ تَسْقِنِي قَالَ يَا رَبِّ كَيْفَ أَسْقِيكَ وَأَنْتَ رَبُّ الْعَالَمِينَ قَالَ اسْتَسْقَاكَ عَبْدِي فُلاَنٌ فَلَمْ تَسْقِهِ أَمَا إِنَّكَ لَوْ سَقَيْتَهُ وَجَدْتَ ذَلِكَ عِنْدِي