The Book of Fasting
22/76. Chapter:
Fasting one day, and not fasting one day, and the difference in the wording of the transmitters Of The Narration Of 'Abdullah Bin 'Amr About It
Sunan an-Nasai
قَالَ وَفِيمَا قَرَأَ عَلَيْنَا أَحْمَدُ بْنُ مَنِيعٍ قَالَ حَدَّثَنَا هُشَيْمٌ، قَالَ أَنْبَأَنَا حُصَيْنٌ، وَمُغِيرَةُ، عَنْ مُجَاهِدٍ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَفْضَلُ الصِّيَامِ صِيَامُ دَاوُدَ عَلَيْهِ السَّلاَمُ كَانَ يَصُومُ يَوْمًا وَيُفْطِرُ يَوْمًا " .
It was narrated that 'Abdullah bin 'Amr said: "The Messenger of Allah said: "The best of fasting is the fast of Dawud, peace be upon him. He used to fast for one day and break his fast for one day."' '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."
Reference : Sunan an-Nasa'i 2388In-book reference : Book 22, Hadith 299English translation : Vol. 3, Book 22, Hadith 2390