“The Messenger of Allah (saw) said to ‘Abbas bin ‘Abdul-Muttalib: ‘O ‘Abbas, O my uncle, shall I not give you a gift, shall I not give you something, shall I not tell you of something which, if you do it, will expiate for ten types of sins? If you do them, Allah will forgive you your sins, the first and the last of them, the old and the new, the unintentional and the deliberate, the minor and the major, the secret and the open, ten types of sin. Pray four Rak’ah, and recite in each Rak’ah the Opening of the Book (Al-Fatihah) and a Surah. When you have finished reciting in the first Rak’ah, while you are standing, say: Subhan-Allah wal- hamdu Lillah wa la ilaha illallah wa Allahu Akbar (Glory if to Allah, praise is to Allah, none has the right to be worshipped but Allah and Allah is the Most Great) fifteen times. Then bow and say it ten times while you are bowing. Then raise your head from Ruku’ and say it ten times. Then go into prostration and say it ten times while you are prostrating. Then raise your head from prostration and say it ten times. Then prostrate and say it ten times. Then raise your head from prostration and say it ten times. That will be seventy-five times in each Rak’ah. Do that in all four Rak’ah. If you can pray it once each day then do so. If you cannot, then once each week; if you cannot, then once each month. If you cannot, then once in your lifetime.’”

The Prophet (PBUH) was informed that I said that I would perform prayers the whole night and observe fasting every day as long as I live. Messenger of Allah (PBUH) said, "Is it you who said this?" I said to him, "O Messenger of Allah! I ransom you with my parents, it is I who said that." Messenger of Allah (PBUH) said, "You will not be able to do that. Observe fast and break it; sleep and get up for prayer, and observe fast for three days during the month; for every good is multiplied ten times and that will be equal to fasting the whole year." I said, "O Messenger of Allah! I can do more than that." He said, "Observe fast one day and leave off the next two days." I said, "O Messenger of Allah! I have strength to do more than that." Messenger of Allah (PBUH) said, "Observe fast every other day, and that is the fasting of Dawud (PBUH) and that is the most moderate fasting".

According to another narration: Messenger of Allah (PBUH) said, "That is the best fasting." I said, "But I am capable of doing more than this". Thereupon, Messenger of Allah (PBUH) said, "There is nothing better than this." 'Abdullah bin 'Amr (May Allah be pleased with them) said (when he grew old): "Had I accepted the three days (fasting during every month) as the Messenger of Allah had said, it would have been dearer to me than my family and my property".

In another narration 'Abdullah is reported to have said: Messenger of Allah (PBUH) said to me, "O 'Abdullah! Have I not been informed that you observe fast during the day and offer prayer all the night." I replied, "Yes, O Messenger of Allah!" Messenger of Allah (PBUH) said, "Don't do that. Observe fast for few days and then leave off for few days, perform prayers and also sleep at night, as your body has a right upon you, and your eyes have a right upon you; and your wife has a right upon you; your visitors have a right upon you. It is sufficient for you to observe fast three days in a month, as the reward of good deeds is multiplied ten times, so it will be like fasting the whole year." I insisted (on fasting) and so I was given a hard instruction. I said, "O Messenger of Allah! I have strength." Messenger of Allah (PBUH) said, "Observe fast like the fasting of Prophet Dawud (PBUH); and do not fast more than that." I said: "How was the fasting of Prophet Dawud?" He (PBUH) said, "Half of the year (i.e., he used to fast on every alternate day)."

Afterwards ...

Umm ad-Darda' said, "Abu'd-Darda' stood up in the night to pray. He was weeping and said, 'O Allah! You made my physical form good, so make my character good!' until morning. I said, 'Abu'd-Darda', your only supplication for the entire night was for good character!' He replied, 'Umm ad-Darda', the Muslim perfects his character until good character enters him into Paradise; and taints his character until his bad character enter him into Hellfire. The Muslim is forgiven while he is asleep.' I asked, 'Abu'd-Darda', how can be forgiven while he is asleep?' He said, 'His brother arises in the night, performs the night prayer, and supplicates to Allah Almighty and is answered. He supplicates for his Muslim brother and his supplication is answered.'"

Abu Hurairah (RAA) narrated that A man came to the Messenger of Allah (P.B.U.H.) and said, “l am ruined O Messenger of Allah (P.B.U.H.)!" The Messenger of Allah (P.B.U.H.) asked him, “What has ruined you?" The man replied, ‘I had intercourse with my wife during the day in Ramadan while fasting)’ The Prophet said to him, "Are you able to free a slave?" The man said, ‘No.’ The Prophet said, "Can you fast for two consecutive months?" He said, ‘NO.' The Prophet then asked him, "Can you provide food for sixty poor people?" He said, ‘No.’ Then the man sat down. A basket of dates was brought to the Prophet and he said to the man, “Give this as Sadaqah (voluntary charity)” The man said, ‘To someone who is poorer than us!’ There is no one in this city (Al-Madinah) who is in need of these dates more than us!’ The Prophet laughed until his molar teeth could be seen and said to the man, “Go and feed your family with these dates.” Related by the seven Imams and the wording is from Muslim.