(50) باب النَّهْىِ أَنْ يُخَصَّ يَوْمُ الْجُمُعَةِ بِصَوْمٍ
Narrated Abu Hurairah:
The Messenger of Allah (ﷺ) as saying: None of you must fast on Friday unless he fasts the day before or the day after.
Reference: Sunan Abi Dawud 2420
In-book reference: Book 14, Hadith 108
English translation: Book 13, Hadith 2414