Sahih Bukhari Volume 2, Book 23, Hadith 1357

حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا حَمَّادٌ ـ وَهْوَ ابْنُ زَيْدٍ ـ عَنْ ثَابِتٍ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ كَانَ غُلاَمٌ يَهُودِيٌّ يَخْدُمُ النَّبِيَّ صلى الله عليه وسلم فَمَرِضَ، فَأَتَاهُ النَّبِيُّ صلى الله عليه وسلم يَعُودُهُ، فَقَعَدَ عِنْدَ رَأْسِهِ فَقَالَ لَهُ ‏"‏ أَسْلِمْ ‏"‏‏.‏ فَنَظَرَ إِلَى أَبِيهِ وَهْوَ عِنْدَهُ فَقَالَ لَهُ أَطِعْ أَبَا الْقَاسِمِ صلى الله عليه وسلم‏.‏ فَأَسْلَمَ، فَخَرَجَ النَّبِيُّ صلى الله عليه وسلم وَهْوَ يَقُولُ ‏"‏ الْحَمْدُ لِلَّهِ الَّذِي أَنْقَذَهُ مِنَ النَّارِ ‏"‏‏

Narrated By Anas : A young Jewish boy used to serve the Prophet and he became sick. So the Prophet went to visit him. He sat near his head and asked him to embrace Islam. The boy looked at his father, who was sitting there; the latter told him to obey Abu-l-Qasim and the boy embraced Islam. The Prophet came out saying: "Praises be to Allah Who saved the boy from the Hell-fire."