Sunan an Nasai 2248
The Book of Fasting
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ عَبْدِ الْحَكَمِ، عَنْ شُعَيْبٍ، قَالَ أَنْبَأَنَا اللَّيْثُ، عَنِ ابْنِ الْهَادِ، عَنْ سُهَيْلٍ، عَنِ ابْنِ أَبِي عَيَّاشٍ، عَنْ أَبِي سَعِيدٍ، أَنَّهُ سَمِعَ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " مَا مِنْ عَبْدٍ يَصُومُ يَوْمًا فِي سَبِيلِ اللَّهِ عَزَّ وَجَلَّ إِلاَّ بَعَّدَ اللَّهُ عَزَّ وَجَلَّ بِذَلِكَ الْيَوْمِ وَجْهَهُ عَنِ النَّارِ سَبْعِينَ خَرِيفًا " .
It was narrated from Abu Saeed that he heard the Messenger of Allah say:"There is no worshipper who fasts a day in the cause of Allah, the mighty and sublime, but Allah the mighty and sublime, will separate his face from the fire by (a distance of) seventy autumns in return for that day
Grading: Abu Ghuddah: Sahih · Al-Albani: Sahih · Zubair Ali Zai: Sahih - Agreed Upon
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.