So the Surah was Revealed to lighten it for him -saww and...

[36] فِي كِتَابِ الْخِصَالِ فِيمَا عَلَّمَ أَمِيرُ الْمُؤْمِنِينَ عَلَيْهِ السَّلَامُ أَصْحَابَهُ مِنَ الْأَرْبَعِمِائَةِ بَابٍ مِمَّا يَصْلُحُ لِلْمُسْلِمِ فِي دِينِهِ وَ دُنْيَاهُ: أَكْثِرُوا الِاسْتِغْفَارَ تَجْلِبُوا الرِّزْقَ، وَ قَدِّمُوا مَا اسْتَطَعْتُمْ مِنْ عَمَلِ الْخَيْرِ تَجِدُوهُ غَداً In the book Al Khisal – ‘Among what Amir Al-Momineen -asws taught his -asws companions from the four hundred subjects from what is correct for the Muslim in his Religion and his world: ‘Frequent the seeking of Forgiveness, you will attract the sustenance, and send ahead whatever you are able to from the good deeds, you will be finding it (with Allah -azwj ) tomorrow!’’.

[37] The Goodly Loan: Allah -azwj Revealed about the Qarz e Hasana (Goodly Loan) in Verses 57:11, 57:18 and 64:17: مَنْ ذَا الَّذِي يُقْرِضُ اللَّهَ قَرْضًا حَسَنًا فَيُضَاعِفَهُ لَهُ وَلَهُ أَجْرٌ كَرِيمٌ {11} Who is that who will lend Allah a goodly loan, so He would double it for him, and for him would be an honourable Recompense [57:11] أَحْمَدُ بْنُ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ أَبِي الْمَغْرَاءِ عَنْ إِسْحَاقَ بْنِ عَمَّارٍ عَنْ أَبِي إِبْرَاهِيمَ ( عليه السلام ) قَالَ سَأَلْتُهُ عَنْ قَوْلِ اللَّهِ عَزَّ وَ جَلَّ مَنْ ذَا الَّذِي يُقْرِضُ اللَّهَ قَرْضاً حَسَناً فَيُضاعِفَهُ لَهُ وَ لَهُ أَجْرٌ كَرِيمٌ قَالَ نَزَلَتْ فِي صِلَةِ الْإِمَامِ Ahmad Bin Muhammad, from Ali Bin Al Hakam, from Abu Al Magra’a, from Is’haq Bin Ammar, ‘From Abu Ibrahim -asws (7 th Imam -asws ), said, ‘I asked him -asws about the Words of Allah -azwj Mighty and Majestic: Who is that who will lend Allah a goodly loan, so He would double it for him, and for him would be an honourable Recompense [57:11] .