Among the people of the book are those whom if you entrust him with a large amount he gives it back to you, and there are those whom if you entrust with one gold coin he will not return it to you unless you are standing over him. That is because they said, "We have no obligation towards the Gentiles." They say about God lies while knowing.
Translation endnotes
[3:75] Religious scholars and clergymen have transformed the meaning of the Arabic word UMmY from ‘gentile’ into ‘illiterate.’ The main reason for this distortion is their attempt to give more credibility to the so-called "literary miracle" of the Quran. As it can be seen in this verse, Jews and Christians were classifying the population of the region into two groups: people with divine books and people without divine books. It is unreasonable to think that in their religious struggle, Jews and Christians divided people into literate and illiterate groups. See 7:157-158; 2:78; 3:20; 25:5.