(63) بَابُ صَوْمِ يَوْمِ الْجُمُعَةِ، فَإِذَا أَصْبَحَ صَائِمًا يَوْمَ الْجُمُعَةِ فَعَلَيْهِ أَنْ يُفْطِرَ
Narrated Abu Huraira:
I heard the Prophet (ﷺ) saying, "None of you should fast on Friday unless he fasts a day before or after it."
Reference: Sahih al-Bukhari 1985
In-book reference: Book 30, Hadith 92
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 31, Hadith 206