Sahih Adab al-Mufrad

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that a Jewish boy used to serve the Prophet (peace and blessings be upon him). He fell ill, so the Prophet (peace and blessings be upon him) came to visit him and sat by his head and said: "Become a Muslim." The boy looked towards his father, who was sitting by his head. The father said to him: "Obey Abul Qasim." So the boy became a Muslim. The Prophet (peace and blessings be upon him) left from him saying, "Praise be to Allah who saved him from the Fire."