Aal-'Imran - 3:75

وَمِنْ أَهْلِ الْكِتَابِ مَنْ إِن تَأْمَنْهُ بِقِنطَارٍ يُؤَدِّهِ إِلَيْكَ وَمِنْهُم مَّنْ إِن تَأْمَنْهُ بِدِينَارٍ لاَّ يُؤَدِّهِ إِلَيْكَ إِلاَّ مَا دُمْتَ عَلَيْهِ قَآئِمًا ذَلِكَ بِأَنَّهُمْ قَالُواْ لَيْسَ عَلَيْنَا فِي الأُمِّيِّينَ سَبِيلٌ وَيَقُولُونَ عَلَى اللّهِ الْكَذِبَ وَهُمْ يَعْلَمُونَ
[3:75]
And among the followers of the Book there are some such that if you entrust one (of them) with a heap of wealth, he shall pay it back to you; and among them there are some such that if you entrust one (of them) with a dinar he shall not pay it back to you except so long as you remain firm in demanding it; this is because they say: There is not upon us in the matter of the unlearned people any way (to reproach); and they tell a lie against Allah while they know.
Among the People of the Book are some who, if entrusted with a hoard of gold, will (readily) pay it back; others, who, if entrusted with a single silver coin, will not repay it unless thou constantly stoodest demanding, because, they say, "there is no call on us (to keep faith) with these ignorant (Pagans)." but they tell a lie against Allah, and (well) they know it.
Among the People of the Scripture there is he who, if thou trust him with a weight of treasure, will return it to thee. And among them there is he who, if thou trust him with a piece of gold, will not return it to thee unless thou keep standing over him. That is because they say: We have no duty to the Gentiles. They speak a lie concerning Allah knowingly.