Divine justice and eternal reward

وَإِنَّ مِنْ أَهْلِ ٱلْكِتَـٰبِ لَمَن يُؤْمِنُ بِٱللَّهِ وَمَآ أُنزِلَ إِلَيْكُمْ وَمَآ أُنزِلَ إِلَيْهِمْ خَـٰشِعِينَ لِلَّهِ لَا يَشْتَرُونَ بِـَٔايَـٰتِ ٱللَّهِ ثَمَنًا قَلِيلًا ۗ أُو۟لَـٰٓئِكَ لَهُمْ أَجْرُهُمْ عِندَ رَبِّهِمْ ۗ إِنَّ ٱللَّهَ سَرِيعُ ٱلْحِسَابِ

And indeed, among the People of the Scripture are those who believe in Allāh and what was revealed to you and what was revealed to them, [being] humbly submissive to Allāh. They do not exchange the verses of Allāh for a small price. Those will have their reward with their Lord. Indeed, Allāh is swift in account.