Rasulullah Sallahu Alayhi Wasalam has said that the person who visits his sick brother continues plucking from the fruits of Jannah until he returns.
In another Hadith it is reported that the one who visits a sick person in the morning, 70,000 malaa’ikah make du’a-e-rahmah (du’a of mercy) for him till the evening and that person who visits a sick person in the evening; 70,000 malaa’ikah make du’a-e-rahmah for him until the morning.
Rasulullah Sallahu Alayhi Wasalam has said that whosoever visits a sick person, an angel calls out from the sky: “You have done well. Your walking is also good and you have built yourself a palace in Jannah.”
Yet another Hadith mentions that the person who makes wudhu properly (i.e. fulfilling all the sunan and mustahabbaat of wudhu) and is hopeful of receiving the rewards for visiting the sick, will be kept away from Jahannum the distance of seventy years.
Nabi Sallahu Alayhi Wasalam is reported that when a person goes to visit the sick he enters into the rahmah (mercy) of Allah . Thereafter, when he sits with the sick person, he is completely covered in the rahmah (mercy) of Allah .