Abu Sa'id Al-Khadari (G. p. H) narrated that the Messenger of Allah (P. B. U. H) said: "Never did a person fast for a day, for the sake of Allah, but that Allah (G. B. H) distanced by that day his face from Fire the distance of seventy years".

[Muslim, Vol. 2, The Book of Fasting, Chapter 31/167].