(76) باب صَوْمِ يَوْمٍ وَإِفْطَارِ يَوْمٍ وَذِكْرِ اخْتِلاَفِ أَلْفَاظِ النَّاقِلِينَ فِي ذَلِكَ لِخَبَرِ عَبْدِ
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." (ES)
Reference (ES): Sunan an-Nasa'i 2388 (ES)
In-book reference (ES): Book 22, Hadith 299 (ES)
English translation (ES): Vol. 3, Book 22, Hadith 2390 (ES)