(44) باب ثَوَابِ مَنْ صَامَ يَوْمًا فِي سَبِيلِ اللَّهِ عَزَّ وَجَلَّ وَذِكْرِ الاِخْتِلاَفِ عَلَى سُهَيْلِ بْنِ أَبِي صَالِحٍ فِي الْخَبَرِ فِي ذَلِكَ
It was narrated from Abu Hurairah that the Messenger of Allah said:
"Whoever fasts one day in the cause of Allah, the Mighty and sublime, Allah will remove his face away from the fire in return for the day (the distance of) seventy autumns.
Reference: Sunan an-Nasa'i 2244
In-book reference: Book 22, Hadith 155
English translation: Vol. 3, Book 22, Hadith 2246