English translation
2399. It was narrated that 'Abdullāh bin 'Amr said: "The Messenger of Allāh ﷺ said: 'I have heard that you stand (in prayer) all night and fast all day.' I said: 'O Messenger of Allāh, I only meant good by that.' He said: 'One who fasts every day of his life has not truly fasted. But I will tell you what fasting for a lifetime means: Three days of every month.' I said: 'O Messenger of Allāh, I am able to do more than that.' He said: 'Fast for five days.' I said: 'I am able to do more than that.' He said: 'Fast for ten.' I said: 'I am able to do more than that.' He said: 'Observe the fast of Dāwūd, peace be upon him; he used to fast one day and not the next.'" (Ṣaḥīḥ)
