Sunan an-Nasa'i 1666
سنن النسائي#1666Sahihأَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، وَعَبْدُ الرَّحْمَنِ، قَالاَ حَدَّثَنَا شُعْبَةُ، عَنْ يَعْلَى بْنِ عَطَاءٍ، أَنَّهُ سَمِعَ عَلِيًّا الأَزْدِيَّ، أَنَّهُ سَمِعَ ابْنَ عُمَرَ، يُحَدِّثُ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " صَلاَةُ اللَّيْلِ وَالنَّهَارِ مَثْنَى مَثْنَى " . قَالَ أَبُو عَبْدِ الرَّحْمَنِ هَذَا الْحَدِيثُ عِنْدِي خَطَأٌ وَاللَّهُ تَعَالَى أَعْلَمُ .
It was narrated from Ya'la bin Ata that he heard Ali Al-Azdi (say) that he heard Ibn Umar narrate that:The Prophet (ﷺ) said: "The prayers of the night and day are two by two
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: 20:69