Narrated from Hazrat Anas (may Allah be pleased with him) that a Jewish boy used to serve the Prophet (peace and blessings be upon him). Once he fell ill, and the Prophet (peace and blessings be upon him) went to visit him. His father was sitting by his head. The Prophet (peace and blessings be upon him) advised him to recite the Kalimah. The boy looked at his father, who said, "Obey Abul Qasim (peace and blessings be upon him)." So the boy recited the Kalimah. When the Prophet (peace and blessings be upon him) left from there, he was saying, "All praise is due to Allah who saved him from Hell because of me."