Anas bin Malik reported,

A young Jewish boy used to prepare the water for the Prophet's ﷺ ablution and bring him his sandals. He fell ill, so the Prophet ﷺ went to visit him and entered the room while the boy's father was sitting by his head.The Prophet ﷺ said to him, "So-and-so, say there is no god but Allah."The boy looked at his father, but his father remained silent. The Prophet ﷺ repeated the words to him, and again the boy looked at his father.His father said, "Obey Abu Qasim."The boy said, "I bear witness that there is no god but Allah and that you are the Messenger of Allah."The Prophet ﷺ then left, saying, "Praise be to Allah, who has saved him from the Fire through me."

حدثنا مؤمل حدثنا حماد حدثنا ثابت

عن أنس

أن غلاما يهوديا كان يضع للنبي ﷺ وضوءه ويناوله نعليه فمرض فأتاه النبي ﷺ فدخل عليه وأبوه قاعد عند رأسه فقال له النبي ﷺ يا فلان قل لا إله إلا الله فنظر إلى أبيه فسكت أبوه فأعاد عليه النبي ﷺ فنظر إلى أبيه فقال أبوه أطع أبا القاسم فقال الغلام أشهد أن لا إله إلا الله وأنك رسول الله فخرج النبي ﷺ وهو يقول الحمد لله الذي أخرجه بي من النار