Sunan Ibn Majah 1664
سنن ابن ماجه#1664Sahihحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَمُحَمَّدُ بْنُ الصَّبَّاحِ، قَالاَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، عَنْ صَفْوَانَ بْنِ عَبْدِ اللَّهِ، عَنْ أُمِّ الدَّرْدَاءِ، عَنْ كَعْبِ بْنِ عَاصِمٍ، قَالَ: قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لَيْسَ مِنَ الْبِرِّ الصِّيَامُ فِي السَّفَرِ " .
It was narrated from Ka’b bin ‘Asim that the Messenger of Allah (ﷺ) said:‘It is not an act of righteousness to fast while traveling.”
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:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 7:27