"The Messenger of Allah entered my apartment and said: "I have been told that you stand all night (in prayer) and fast all day.' I said: 'Yes (I do).' He said: 'Do not do that. Sleep and stand (in prayer); fast and break your fast. For your eyes have a right over you, your body has a right over you, your body has a right over you, your wife has a right over you, your guest has a right over you, and your friend has a right over you. I hope that you will have a long life and that it will be sufficient for you to fast three days of each month. That is fasting for a lifetime, because a good deed is equal to ten like it.' I said : 'I feel able to do more.' I was strict, so I was dealt with strictly. He said: 'Fast three days each week.' I said: 'I am ableto do more thtn that; I was strict, so I was dealt with strictly. He said: 'Observe the fast of the Prophet of Allah, Dawud, peace be upon him. I said: 'What was the fast of Dawud?' he said: 'Half of a lifetime."' 'Ata said: "someone who heard him told me that Ibn 'Umar (said) that the Prophet said: 'Whoever fasts every day of his life, then he has not fasted."