Sunan Ibn Majah 1723
سنن ابن ماجه#1723SahihIt 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
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiSahih - Bukhari And Muslim
In-book reference: 7:86