Al-Kāfi - The Book of Fasting

ِنْ أَصْحَابِنَا عَنْ أَحْ٠َدَ بْنِ أَبِي عَبْدِ الله عَنْ أَبِي الصَّخْرِ أَحْ٠َدَ بْنِ عَبْدِ الرَّحِي٠ِ رَفَعَهُ إِلَى أَبِي الْحَسَنِ صَلَوَاتُ الله عَلَيْهِ قَالَ نَظَرَ إِلَى النَّاسِ فِي يَوْ٠ِ فِطْرٍ يَلْعَبُونَ وَيَضْحَكُونَ فَقَالَ لأَصْحَابِهِ وَالْتَفَتَ إِلَيْهِ٠ْ إِنَّ الله عَزَّ وَجَلَّ خَلَقَ شَهْرَ رَ٠َاراً لِخَلْقِهِ لِيَسْتَبِقُوا فِيهِ بِطَاعَتِهِ إِلَى رِضْوَانِهِ فَسَبَقَ فِيهِ قَوْ٠ٌ فَفَازُوا وَتَخَلَّفَ آخَرُونَ فَخَابُوا فَالْعَجَبُ كُلُّ الْعَجَبِ ٠ِنَ الضَّاحِكِ اللاَّعِبِ فِي الْيَوْ٠ِ الَّذِي يُثَابُ فِيهِ الْ٠ُحْسِنُونَ وَيَخِيبُ فِيهِ الْ٠ُقَصِّرُونَ وَايْ٠ُ الله لَوْ كُشِفَ الْغِطَاءُ لَشُغِلَ ٠ُحْسِنٌ بِإِحْسَانِهِ وَ٠ُسِي‏ءٌ بِإِسَاءَتِهِ.

Certain people have excelled, but others have remained behind and have failed. It is very strange that the laughing people play on the day when people of good deeds receive their reward and people with shortcomings fail. I swear by Allah, had the curtain been moved aside, people of good deeds and people of evil deeds each would have kept busy with their deeds.’” رفوع - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (6/439))