Visiting the Sick

1.
Feed the hungry, visit the sick and free the captive.
(Bukhari)

2.
A Muslim has five duties towards another Muslim; to return a salutation, visit the sick, follow funerals, accept an invitation and say 'God have mercy on you' when one sneezes.
(Bukhari, Muslim)

3.
When you visit an invalid tell him to make a supplication for you, for his supplication is like of the angels.
(Ibn Majah)