Sunan an-Nasa'i, Volume 3, Book 22, Hadith 2375 (DarusSalam) ⓘ
It was narrated that 'Abdullah bin 'Umar said: "The Messenger of Allah said: 'Whoever fasts every day of his life, then he has not fasted."'
أَخْبَرَنِي حَاجِبُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا الْحَارِثُ بْنُ عَطِيَّةَ، قَالَ حَدَّثَنَا الأَوْزَاعِيُّ، عَنْ عَطَاءِ بْنِ أَبِي رَبَاحٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ صَامَ الأَبَدَ فَلاَ صَامَ " .
also referenced under: Hadith 2373 (Reference) & Book 22, Hadith 284 (In-Book)