Allaah distances him from Hellfire, the distance of 100 years

Upon the authority of 'Uqbah ibn Aamir  who said that the Messenger of Allaahصلّى اللَّهُ عليه وسلّم  said :

"Whoever fasts a day for the sake of Allaah, then Allaah distances him from Hellfire (Jahannam) the distance of 100 years."

{Nisaa'ee & declared 'Hasan' by Sheikh a-Albaani in 'Saheehul Jaami' (6330)}