Sunan Ibn Majah 1723
سنن ابن ماجه#1723Sahihحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، وَحَفْصُ بْنُ غِيَاثٍ، عَنِ الأَعْمَشِ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ: نَهَى رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ عَنْ صَوْمِ يَوْمِ الْجُمُعَةِ إِلاَّ بِيَوْمٍ قَبْلَهُ، أَوْ يَوْمٍ بَعْدَهُ .
It was narrated that Abu Hurairah said:“The Messenger of Allah (ﷺ) forbade fasting on a Friday unless it (is joined to) the day before or the day after.”
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
Zubair Ali ZaiSahih - Bukhari And Muslim
In-book reference: 7:86