"Whoever fasts one day in the cause of Allah, the mighty and sublime, Allah will separate him the distance of one hundred years from the fire." (Using translation from Nasāʾī 2254)
عَنْ رَسُولِ اللهِ ﷺ قَالَ «مَنْ صَامَ يَوْمًا فِي سَبِيلِ اللهِ بَاعَدَ اللهُ مِنْهُ جَهَنَّمَ مَسِيرَةَ مِائَةِ عَامٍ»