It was narrated from Abu Saeed that he heard the Messenger of Allah say:
"There is no worshipper who fasts a day in the cause of Allah, the mighty and sublime, but Allah the mighty and sublime, will separate his face from the fire by (a distance of) seventy autumns in return for that day."
Reference: Sunan an-Nasa'i 2248 In-book : Book 22, Hadith 159 English translation : Vol. 3, Book 22, Hadith 2250
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