Narrated `Abdullah bin `Amr: Allah's Apostle entered upon me and said, Have I not been informed that you offer prayer all the night and fast the whole day? I said, Yes. He said, Do not do so; Offer prayer at night and also sleep; Fast for a few days and give up fasting for a few days because your body has a right on you, and your eye has a right on you, and your guest has a right on you, and your wife has a right on you. I hope that you will have a long life, and it is sufficient for you to fast for three days a month as the reward of a good deed, is multiplied ten times, that means, as if you fasted the whole year. I insisted (on fasting more) so I was given a hard instruction. I said, I can do more than that (fasting) The Prophet said, Fast three days every week. But as I insisted (on fasting more) so I was burdened. I said, I can fast more than that. The Prophet said, Fast as Allah's prophet David used to fast. I said, How was the fasting of the prophet David? The Prophet said, One half of a year (i.e. he used to fast on alternate days). '