Narrated Anas (r.a): A young Jew became ill. The Prophet (peace be upon him) went to visit him. He sat down by his head and said to him: Accept Islam. He looked at his father who was beside him near his head, and he said: Obey Abu al-Qasim. So he accepted Islam, and the Prophet (peace be upon him) stood up saying: Praise be to Allah Who has saved him through me from Hell.
Sunan Abi Dawud, Book 21, Hadith 7