He said, "How is it with the man who fasts one day, and breaks the fast one day?" He replied, "That was the fast of David." He said, "How is it with the man who fasts one day, and abstains from fasting two days?" He replied, "I wished that I might be able to do that." Then the Apostle of God said, "Three days in each month and the month Ramaḍán (are sufficient) till the next Ramaḍán; and this is the fast of the whole year, and the fast of the day of Arafat. I hope in God that these will atone for the year which precedes it and the year which follows it. And the fast of the day of ʿAshura, I hope in God that it will atone for the year which precedes it."'—Muslim.
It is related from Abú Saʿíduʾl-Khudri that he said, 'The Apostle of God forbade fasting on the day of the breaking of the fast and on the day of sacrifice.'—Muslim, Al Bukhárí.
It is related from Abú Saʿíduʾl-Khudri that, 'The Apostle of God said, "He who fasts one day in the road of God, God removes his face seventy years from the fire."'—Muslim, Al Bukhárí.
It is related from ʿAbduʾlláh bin ʿAmru binuʾl-ʿÁṣ that he said, 'The Apostle of God said tome, "O ʿAbduʾlláh, have I not been informed that thou dost fast in the day and stand up (in prayer) during the night?" I said, "Yes, O Apostle of God." He replied, "Then do not do it. Keep the fast, and also eat; and stand up to pray, and also sleep; for verily thou hast a duty towards thy body, and thou hast a duty towards thine eyes, and thou hast a duty towards thy wife, and thou hast a duty towards thy guests. He who fasts all the time, does not fast at all. The fast of three days in each month is equal to a constant fast, therefore fast three days in each month, and read the Qurʾán in every month." I said, " Verily I am able to do more than that." He replied, "Fast. The best fast is the fast of David, namely to fast one day and eat one day. And recite the (Qurʾán) once in every seven nights, and do not do more than that."'—Muslim, Al Bukhárí.
It is related from ʿÁyesha that, 'The Apostle of G d used to fast on Mondays and Thursdays.'—At Tirmidhí, An Nasái.
It is related from Abú Hurairah that, 'The Apostle of God said, "The actions of men are placed before God on Mondays
