Al-Kāfi - Volume 4 > The Excellence of Fast and Fasting
Hadith #7

7ـ عَلِيٌّ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ سُلَيْمَانَ عَمَّنْ ذَكَرَهُ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) فِي قَوْلِ الله عَزَّ وَجَلَّ وَاسْتَعِينُوا بِالصَّبْرِ قَالَ الصَّبْرُ الصِّيَامُ وَقَالَ إِذَا نَزَلَتْ بِالرَّجُلِ النَّازِلَةُ وَالشَّدِيدَةُ فَلْيَصُمْ فَإِنَّ الله عَزَّ وَجَلَّ يَقُولُ وَاسْتَعِينُوا بِالصَّبْرِ يَعْنِي الصِّيَامَ.

7. Ali has narrated from his father from ibn abu ‘Umayr from Sulayman from those whom he has mentioned who has said the following: “This is about the words of Allah, the Most Majestic, the Most Glorious, ‘Seek support through patience.’ (2:45) Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘“Patience” is a reference to fasting.’ He further said, ‘If a man faces severe difficulties, he should fast. Allah, the Most Majestic, the Most Glorious, has said, “Seek support through patience,” that is, “fasting.””’