Ibn Kathir (Abridged)
Hafiz Ibn Kathirمِّنْ أَهْلِ الْكِتَـبِ أُمَّةٌ قَآئِمَةٌ يَتْلُونَ ءَايَـتِ اللَّهِ ءَانَآءَ الَّيْلِ وَهُمْ يَسْجُدُونَ(A party of the people of the Scripture stand for the right, they recite the verses of Allah during the hours of the night, prostrating themselves in prayer) 3:113, وَإِنَّ مِنْ أَهْلِ الْكِتَـبِ لَمَن يُؤْمِنُ بِاللَّهِ وَمَآ أُنزِلَ إِلَيْكُمْ وَمَآ أُنزِلَ إِلَيْهِمْ خَـشِعِينَ للَّهِ لاَ يَشْتَرُونَ بِـَايَـتِ اللَّهِ ثَمَناً قَلِيلاً أُوْلـئِكَ لَهُمْ أَجْرُهُمْ عِندَ رَبِّهِمْ إِنَّ اللَّهَ سَرِيعُ الْحِسَابِ (And there are, certainly, among the People of the Scripture, those who believe in Allah and in that which has been revealed to you, and in that which has been revealed to them, humbling themselves before Allah. They do not sell the verses of Allah for a small price, for them is a reward with their Lord.
Surely, Allah is Swift in account.) 3:199 الَّذِينَ ءَاتَيْنَـهُمُ الْكِتَـبَ مِن قَبْلِهِ هُم بِهِ يُؤْمِنُونَ - وَإِذَا يُتْلَى عَلَيْهِمْ قَالُواْ ءَامَنَّا بِهِ إِنَّهُ الْحَقُّ مِن رَّبِّنَآ إنَّا كُنَّا مِن قَبْلِهِ مُسْلِمِينَ أُوْلَـئِكَ يُؤْتُونَ أَجْرَهُم مَّرَّتَيْنِ بِمَا صَبَرُواْ(Those to whom We gave the Scripture before it, they believe in it (the Qur'an). And when it is recited to them, they say: "We believe in it. Verily, it is the truth from our Lord. Indeed even before it we have been from those who submit themselves. These will be given their reward twice over, because they are patient.)28:52-54, and, قُلْ ءَامِنُواْ بِهِ أَوْ لاَ تُؤْمِنُواْ إِنَّ الَّذِينَ أُوتُواْ الْعِلْمَ مِن قَبْلِهِ إِذَا يُتْلَى عَلَيْهِمْ يَخِرُّونَ لِلاٌّذْقَانِ سُجَّدًا - وَيَقُولُونَ سُبْحَانَ رَبِّنَآ إِن كَانَ وَعْدُ رَبِّنَا لَمَفْعُولاً - وَيَخِرُّونَ لِلاٌّذْقَانِ يَبْكُونَ وَيَزِيدُهُمْ خُشُوعًا (Verily, those who were given knowledge before it, when it (this Qur'an) is recited to them, fall down on their faces in humble prostration. And they say: "Glory be to our Lord!
Truly, the promise of our Lord must be fulfilled." And they fall down on their faces weeping and it increases their humility.)17:107-109