Musnad Abi Ya'la 4306 — a young Jewish man used to serve the Prophet

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that a young Jewish man 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 asked him: "Do you bear witness that there is none worthy of worship except Allah and that I am the Messenger of Allah?" The narrator said: The young man began to look at his father (for a decision), and his father said to him: Say what Muhammad (peace and blessings be upon him) is telling you. So he accepted Islam and then died. The Prophet (peace and blessings be upon him) said to his Companions: "Offer the funeral prayer for your (Muslim) companion."