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It was narrated that ‘Abdullah bin Mawhab said: “I heard Tamim Ad- Dari say: ‘I said: O Messenger of Allah, what is the Sunnah concerning a man from among the People of the Book who becomes a Muslim at the hands of another man?’ He said: ‘He is the closest of all people to him in life and in death.’”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ عَبْدِ الْعَزِيزِ بْنِ عُمَرَ، عَنْ عَبْدِ اللَّهِ بْنِ مَوْهَبٍ، قَالَ سَمِعْتُ تَمِيمًا الدَّارِيَّ، يَقُولُ قُلْتُ يَا رَسُولَ اللَّهِ مَا السُّنَّةُ فِي الرَّجُلِ مِنْ أَهْلِ الْكِتَابِ يُسْلِمُ عَلَى يَدَىِ الرَّجُلِ قَالَ " هُوَ أَوْلَى النَّاسِ بِمَحْيَاهُ وَمَمَاتِهِ " .
sunnah.com