Sunan an-Nasa'i 2376
سنن النسائي#2376Sahihأَخْبَرَنَا إِسْمَاعِيلُ بْنُ يَعْقُوبَ، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ مُوسَى، قَالَ حَدَّثَنَا أَبِي، عَنِ الأَوْزَاعِيِّ، عَنْ عَطَاءٍ، قَالَ حَدَّثَنِي مَنْ، سَمِعَ ابْنَ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " 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 ZaiSahih
In-book reference: 22:287