The Prophet (pbuh) said: “There are five duties that the Muslim owes to his brother Muslim,” one of which is visiting the sick.
The Prophet (pbuh) said, "Free the captives, feed the hungry and pay a visit to the sick."
This hadeeth indicates that it is obligatory, and may be understood as meaning that it is a communal obligation, like feeding the hungry and freeing the captives.
The Prophet (pbuh) said: “When the Muslim visits his (sick) Muslim brother, he is harvesting the fruits of
The Messenger of Allaah (pbuh) said: “Whoever visits a sick person or visits a brother in Islam, a caller cries out to him: ‘May you be happy, may your walking be blessed, and may you occupy a dignified position in
Imam Ahmad narrated that Jaabir (ra) said: The Messenger of Allaah (pbuh) said: “Whoever visits a sick person is plunging into mercy until he sits down, and when he sits down he is submerged in it.” Classed as saheeh by al-Albaani in al-Silsilah al-Saheehah, 2504.
Al-Tirmidhi narrated that ‘Ali (ra) said: I heard the Messenger of Allaah (pbuh) say: “There is no Muslim who visits a (sick) Muslim early in the morning but seventy thousand angels send blessings upon him until evening comes, and if he visits him in the evening, seventy thousand angels send blessings upon him until morning comes, and he will have a garden in Paradise.” Classed as saheeh by al-Albaani in Saheeh al-Tirmidhi.
Making dua for the sick person
Du’aa’ should be made for the sick person in the manner narrated in the Sunnah: “La ba’s, tuhoor in sha Allaah (No worry, it is a purification, if Allah wills).” (Al-Bukhaari).
Du’aa’ for healing should be said three times. The Prophet (pbuh) visited Sa’d ibn Abi Waqqaas and said: “O Allaah, heal Sa’d,” three times. (Al-Bukhaari & Muslim).
The Prophet (pbuh) used to place his right hand on the sick person and say: “Adhhib al-ba’s Rabb an-naas, wa’shfi anta al-Shaafi, laa shifaa’a illa shifaa’uka shifaa’an laa yughaadir saqaman (Take away the pain, O Lord of mankind, and grant healing, for You are the Healer, and there is no healing but Your healing that leaves no trace of sickness).” (Sahih Muslim)
It was narrated by Ahmad and Abu Dawood that the Prophet (pbuh) said: “Whoever visits a sick person who is not yet dying, and says seven times in his presence: ‘As’alu Allaaha rabb al-‘arsh il-‘azeem an yashfiyaka (I ask Allaah, Lord of the mighty Throne, to heal you), Allaah will heal him of that sickness.” Classed as saheeh by al-Albaani in Saheeh Abi Dawood.
Taken from www.islamqa.com