‘Abdullah bin ‘Amr bin Al- ‘As said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم heard that I was fasting Continually and praying all night.” Either he sent for him, or he happened to meet him and he said: “Have I not been told that you fast
and never break your fast, and you pray all night? Do not do that, for your eyes should have a share, your self should have a share, and your family should have a share. Fast and break your fast; pray and sleep. Fast one day out of every ten, and you will have the reward of the other nine.” He said: “I am able to do more than that, Messenger of Allah صلی اللہ علیہ وآلہ وسلم.” He said: “Observe the fast of Dawud then.” “I said: ‘How did Dawud fast, Prophet of Allah صلی اللہ علیہ وآلہ وسلم?’ He said: ‘He used to fast one day, and not the next, and he never fled if he met (the enemy in battle).” He said: “How can I compare to him, Prophet of Allah صلی اللہ علیہ وآلہ وسلم?” (Sahih)