The Messenger of Allah ﷺ as saying: None of you must fast on Friday unless he fasts the day before or the day after. (Using translation from Abū Dāʾūd 2420)
قَالَ رَسُولُ اللهِ ﷺ لَا تَصُومُوا يَوْمَ الْجُمُعَةِ إِلَّا وَقَبْلَهُ يَوْمٌ أَوْ بَعْدَهُ يَوْمٌ