«لَا تَسْتَكْثِرُوا كَثِيرَ الْخَيْرِ وَ تَسْتَقِلُّوا قَلِيلَ الذُّنُوبِ ، فَإِنَّ قَلِيلَ الذُّنُوبِ يَجْتَمِعُ حَتّى يَصِيرَ كَثِيراً؛ وَ خَافُوا اللَّهَ فِي السِّرِّ حَتّى تُعْطُوا مِنْ أَنْفُسِكُمُ النَّصَفَ، وَ سَارِعُوا إِلى طَاعَةِ اللَّهِ، وَ اصْدُقُوا الْحَدِيثَ، وَ أَدُّوا الْأَمَانَةَ، فَإِنَّمَا ذلِكَ لَكُمْ؛ وَ لَاتَدْخُلُوا فِيمَا لَايَحِلُّ لَكُمْ، فَإِنَّمَا ذلِكَ عَلَيْكُمْ».
Imam al-Kazim (as):
Do not regard a great deal of good that you do as too much and do not deem your petty sins as insignificant, for verily petty sins accumulate until they become a great deal. Have fear of Allah in private so you can maintain fairness despite yourselves, hasten towards obedience to your Lord, be truthful in your speech, return the trust [to its owner], for verily that is for your own good, and do not engage in that which is not lawful, for it is in your own detriment.
Source:
al-Kāfī
Vol4
P278
ID: 16992