Thawāb al-Aʿmāl wa ʿiqāb al-Aʿmāl

Hadith 173
night-prayer
وَ بِهَذَا الْإِسْنَادِ عَنْ أَبِی عَبْدِ اللَّهِ ع أَنَّهُ جَاءَهُ رَجُلٌ فَشَکَا إِلَیْهِ الْحَاجَهَ فَأَفْرَطَ فِی الشِّکَایَهِ حَتَّی کَادَ أَنْ یَشْکُوَ الْجُوعَ فَقَالَ لَهُ أَبُو عَبْدِ اللَّهِ ع یَا هَذَا أَ تُصَلِّی بِاللَّیْلِ قَالَ فَقَالَ الرَّجُلُ نَعَمْ قَالَ فَالْتَفَتَ أَبُو عَبْدِ اللَّهِ ع إِلَی صَاحِبِهِ فَقَالَ کَذَبَ مَنْ زَعَمَ أَنَّهُ یُصَلِّی بِاللَّیْلِ وَ یَجُوعُ بِالنَّهَارِ إِنَّ اللَّهَ عَزَّ وَ جَلَّ ضَمِنَ بِصَلَاهِ اللَّیْلِ قُوتَ النَّهَارِ.
5. It is narrated from Imam Ja’far Sadiq (a.s.) that a person came to him and expressed his wish. He was about to complain of his starvation when Imam asked him, “Do you offer Salaat-e-Shab?” He said, “Yes.” Imam turned to him and said, “He is a liar that claims to offer Salaat-e-Shab and says that he has to starve during the day, because the Almighty Allah has guaranteed the sustenance of the day in the Salaat-e-Shab.”
Source: Shaykh Muḥammad b. ʿAlī al-Ṣaduq