Musnad Ahmad 32:1431

Yunus narrated to us, Hammad narrated to us, from Thabit, who said: I do not know it except from Anas, that a young boy from the Jews used to serve the Prophet, may Allah bless him and grant him peace. He became ill, so the Prophet, may Allah bless him and grant him peace, came to visit him while he was at the point of death. He invited him to Islam. The boy looked at his father, who was at his head, and his father said to him: "Obey Abu al-Qasim." So he accepted Islam, then he died. The Messenger of Allah, may Allah bless him and grant him peace, went out from his presence while he was saying: "Praise be to Allah who saved him from the Fire through me."