Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:3:75 –

And among the People of the Scripture is he who, if you entrust him with a great amount ˹of wealth˺, he will return it to you. And among them is he who, if you entrust him with a ˹single˺ silver coin, he will not return it to you unless you are constantly standing over him ˹demanding it˺. That is because they say, "There is no blame upon us concerning the unlearned." And they speak untruth about Allah while they know ˹it˺.  

And of the People of the Scripture is he who, if you trust him with a hundredweight, that is, with much money, he will return it to you, on account of his trustworthiness, the like of ‘Abd Allāh b. Salām to whom a man entrusted 1200 plates of gold, which he then returned to him; and of them is he who, if you trust him with one dinar, will not return it to you, on account of his treachery; unless you keep standing over him, not leaving him for one minute, for as soon as you leave him, he will deny it, as was the case with Ka‘b b. alAshraf, to whom a man from Quraysh entrusted a dinar and later denied it. That, refusal to return things, is because they say, ‘We have no duty towards, namely, ˹no possibility of acquiring˺ sin because of, the Gentiles’, the Arabs; for they considered it lawful to be unjust towards any person of a different religion, and they attributed ˹the source of˺ this conviction to God, exalted be He. God, exalted be He, says, They speak falsehood against God, by attributing such things to Him, while they are aware, that they are liars.
القرآن:٣:٧٥ –

وَمِنْ أَهْلِ الْكِتَابِ مَنْ إِنْ تَأْمَنْهُ بِقِنْطَارٍ يُؤَدِّهِ إِلَيْكَ وَمِنْهُمْ مَنْ إِنْ تَأْمَنْهُ بِدِينَارٍ لَا يُؤَدِّهِ إِلَيْكَ إِلَّا مَا دُمْتَ عَلَيْهِ قَائِمًا ۗ ذَٰلِكَ بِأَنَّهُمْ قَالُوا لَيْسَ عَلَيْنَا فِي الْأُمِّيِّينَ سَبِيلٌ وَيَقُولُونَ عَلَى اللَّهِ الْكَذِبَ وَهُمْ يَعْلَمُونَ  

{ومن أهل الكتاب من إن تأمنه بقنطار} أي بمال كثير {يؤدَّه إليك} لأمانته كعبد الله بن سلام أودعه رجل ألفا ومائتي أوقية ذهبا فأعادها إليه {ومنهم من إن تأمنه بدينار لا يؤده إليك} لخيانته {إلا ما دمت عليه قائما} لا تفارقه فمتى فارقته أنكره ككعب بن الأشرف استودعه قرشي دينارا فجحده {ذلك} أي ترك الأداء {بأنهم قالوا} بسبب قولهم {ليس علينا في الأميين} أي العرب {سبيل} أي إثم لاستحلالهم ظلم من خالف دينهم ونسبوه إليه تعالى، قال تعالى {ويقولون على الله الكذب} في نسبة ذلك إليه {وهم يعلمون} أنهم كاذبون.