Sahih: Supplication of the Prophet for the sick.

Classification: Sahih (authentic)

From among the supplications that the Prophet (blessings and peace of Allah be upon him) used to make for a sick person was:

“Allaahumma Rabb an-naas, mudhhib al-ba’s ishfi anta al-Shaafi, laa shaafiya illa anta, shifaa’an laa yughaadir saqaman (O Allaah, Lord of mankind, the One Who relieves hardship, grant healing, for there is no healer but You, a healing that leaves no trace of sickness).” Narrated by Al-Bukhari (5750) and Muslim (2191).

Sahih: Jewish boy who got sick accepted Islam.

Classification: Sahih (authentic)

From Anas (may Allah be pleased with him) who said: “A Jewish boy used to serve the Prophet (peace and blessings of Allah be upon him), and he fell sick. The Prophet (peace and blessings of Allah be upon him) went and visited him. He sat by his head and said, ‘Enter Islam.’ The boy looked at his father, who was present. (His father) said, ‘Obey Abu’l-Qaasim (meaning the Prophet peace and blessings of Allah be upon him).’ So the boy entered Islam and the Prophet (peace and blessings of Allah be upon him) left saying, ‘Praise be to Allah Who has saved him from the Fire.’”
Narrated by Al-Bukhaari (1356)