He (PBUH) used to praise Allah and become happy at their becoming Muslim

“Once a Jewish boy who used to serve the Prophet of Allah, sallallaahu ‘alayhi wa sallam, fell sick. The Prophet of Allah, sallallaahu ‘alayhi wa sallam, went and paid him a visit. He sat by the boy’s head and said to him: ‘Accept Islam.’ The boy looked towards his father, who was also present, and the father said: ‘Obey Abu Al-Qaasim,’ and so the boy accepted Islam. When the Prophet of Allah, sallallaahu ‘alayhi wa sallam, left, he was saying: ‘All praise is due to Allah Who saved him from the Hellfire