One who fasts a single day is distanced from Hellfires at a distance of seventy years

Every servant of Allah who observes fast for a day in the way of Allah, Allah would remove, because of this day, his face farther from the Fire (of Hell) to the extent of seventy years' distance.  

قَالَ رَسُولُ اللَّهِ ﷺ: «مَا مِنْ عَبْدٍ يَصُومُ يَوْمًا فِي سَبِيلِ اللَّهِ إِلاَّ بَاعَدَ اللَّهُ بِذَلِكَ الْيَوْمِ وَجْهَهُ عَنِ النَّارِ سَبْعِينَ خَرِيفًا۔»  

This hadith has been narrated by Suhail with the same chain of transmitters.  

عَنْ سُهَيْلٍ بِهَذَا الإِسْنَادِ  

He who observes fast for a day in the way of Allah He would remove his face from the Hell to the extent of seventy years' distance.  

عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ؓ قَالَ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنْ صَامَ يَوْمًا فِي سَبِيلِ اللَّهِ بَاعَدَ اللَّهُ وَجْهَهُ عَنِ النَّارِ سَبْعِينَ خَرِيفًا