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۔»