Sunan an-Nasa'i 1439
سنن النسائي#1439Sahihأَخْبَرَنَا مُحَمَّدُ بْنُ عَلِيِّ بْنِ الْحَسَنِ بْنِ شَقِيقٍ، قَالَ أَبِي أَنْبَأَنَا أَبُو حَمْزَةَ، - وَهُوَ السُّكَّرِيُّ - عَنْ مَنْصُورٍ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، عَنْ عَبْدِ اللَّهِ، قَالَ صَلَّيْتُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي السَّفَرِ رَكْعَتَيْنِ وَمَعَ أَبِي بَكْرٍ رَكْعَتَيْنِ وَمَعَ عُمَرَ رَكْعَتَيْنِ رضى الله عنهما .
It was narrated that 'Abdullah said:"I prayed two rak'ahs with the Messenger of Allah (ﷺ) on a journey, and two rak'ahs with Abu Bakr, and two rak'ahs with 'Umar, may Allah (SWT) be pleased with them both
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: 15:7