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 (invitation) of another man?’ He said: ‘He is the closest of all people to him in life and in death.’”
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 ” .
Reference : Sunan Ibn Majah 2752
In-book reference : Book 23, Hadith 34
English translation : Vol. 4, Book 23, Hadith 2752