"Whoever fasts one day in the cause of Allah, the Mighty and Sublime, Allah will separate his face from the fire by (a distance of) seventy years." (Using translation from Nasāʾī 2247)
عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ صَامَ يَوْمًا فِي سَبِيلِ اللهِ بَاعَدَ اللهُ وَجْهَهُ مِنْ جَهَنَّمَ سَبْعِينَ عَامًا»