It was narrated that Abu Saeed Al-Khudri said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم said: ‘There is no worshipper who fasts a day in the cause of Allah, but Allah, the Most High, will separate (a distance of) seventy autumns between his face and the Fire in return for that day.” (Sahih)