Sunan an-Nasa'i 2375
سنن النسائي#2375Sahihأَخْبَرَنَا الْعَبَّاسُ بْنُ الْوَلِيدِ، قَالَ حَدَّثَنَا أَبِي وَعُقْبَةُ، عَنِ الأَوْزَاعِيِّ، قَالَ حَدَّثَنِي عَطَاءٌ، قَالَ حَدَّثَنِي مَنْ، سَمِعَ ابْنَ عُمَرَ، يَقُولُ قَالَ النَّبِيُّ صلى الله عليه وسلم " مَنْ صَامَ الأَبَدَ فَلاَ صَامَ " .
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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 22:286