Can you fast on Friday alone?
Summary
Singling out Friday for an optional fast without a reason is disliked; fast a day before or after, unless it matches another prescribed fast.
Detailed Answer
The Prophet ﷺ prohibited singling out Friday for fasting unless a person fasts the day before or after . The ruling does not cover obligatory makeup, vows, regular patterns, or independently recommended dates.
This summary is also supported by: , .
Sources (3)
Prophetic Hadith
لَا تَخْتَصُّوا يَوْمَ الْجُمُعَةِ بِصِيَامٍ
“Sahih Muslim 1144”
حَدَّثَنَا عُمَرُ بْنُ حَفْصِ بْنِ غِيَاثٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، حَدَّثَنَا أَبُو صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ " لاَ يَصُومَنَّ أَحَدُكُمْ يَوْمَ الْجُمُعَةِ، إِلاَّ يَوْمًا قَبْلَهُ أَوْ بَعْدَهُ "
“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."”
حَدَّثَنَا عَمْرٌو النَّاقِدُ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ عَبْدِ الْحَمِيدِ بْنِ جُبَيْرٍ، عَنْ مُحَمَّدِ، بْنِ عَبَّادِ بْنِ جَعْفَرٍ سَأَلْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ - رضى الله عنهما - وَهُوَ يَطُوفُ بِالْبَيْتِ أَنَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ صِيَامِ يَوْمِ الْجُمُعَةِ فَقَالَ نَعَمْ وَرَبِّ هَذَا الْبَيْتِ .
“Muhammad b. 'Abbas b. Ja'far reported: I asked Jabir b. 'Abdullah (Allah be pleased with both of them) as he was circumambulating the House (Ka'ba) whether the Messenger of Allah (ﷺ) had forbidden the fasting on Friday, whereupon he said: Yes, by the Lord of this House.”
This is general educational information, not a personal fatwa. Ask a trusted scholar about your specific circumstances.