Whoever observes fast for a day in the way of Allah

fasting a day - 70 years from Hellfire

Abu Sa’eed al Khudri (Allah be pleased with him) reported Allah’s Messenger (صلى الله عليه و سلم) as saying:

Every servant of Allah who observes fast for a day in the way of Allah, Allah would remove, because of this day, his face farther from the Fire (of Hell) to the extent of seventy years’ distance.

[Saheeh Muslim]