Narrated Abu Sa’id Al Khudri : That the Prophet (ﷺ) said: "A worshipper does not fast a day in the cause of Allah except that, that day (of fasting) distances the Fire from his face by seventy autumns." [Abu 'Eisa said:] This Hadith is Hasan Sahih

English translation · Jami' at-Tirmidhi