A group of the Israelites were of opinion that they were not responsible for other's trust and deposite! Their logic was that they were the followers of the scriptures, and have had the prophets among them. and so were they not bound to be faithful to the Gentiles, pagans, and heathens!
There were also groups of good and honest men among them who would observe and reserve all rights of other people, whether in their race and religion, or out of it.
Qurän does not condemn all of them, for the wrong that some of them have done; but meanwhile it shows that those who hold the right for themselves to usurp the properties of other people by forcible seizure, without any right; they do not understand any language other than that of power and force, so one has to answer such people accordingly and with that language.