Sunan an-Nasa'i 2380
سنن النسائي#2380Sahihأَخْبَرَنِي عَمْرُو بْنُ هِشَامٍ، قَالَ حَدَّثَنَا مَخْلَدٌ، عَنِ الأَوْزَاعِيِّ، عَنْ قَتَادَةَ، عَنْ مُطَرِّفِ بْنِ عَبْدِ اللَّهِ بْنِ الشِّخِّيرِ، أَخْبَرَنِي أَبِي أَنَّهُ، سَمِعَ رَسُولَ اللَّهِ صلى الله عليه وسلم وَذُكِرَ عِنْدَهُ رَجُلٌ يَصُومُ الدَّهْرَ قَالَ " لاَ صَامَ وَلاَ أَفْطَرَ " .
It was narrated from Mutarrif bin 'Abdullah bin 'Abdullah bin Ash-Shikhkhir:"My father told me that he heard the Messenger of Allah say, when mention was made in his presence of a man who fasted for the rest of his life: 'He neither fasted nor broke his fast."' '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:
In-book reference: 22:291