Sahih Muslim
Sahih Muslim 1143 b
It is disliked to single out Friday for fasting, unless it coincides with a day that one customarily fasts
Arabic hadith text
وَحَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنِي عَبْدُ الْحَمِيدِ، بْنُ جُبَيْرِ بْنِ شَيْبَةَ أَنَّهُ أَخْبَرَهُ مُحَمَّدُ بْنُ عَبَّادِ بْنِ جَعْفَرٍ، أَنَّهُ سَأَلَ جَابِرَ بْنَ عَبْدِ اللَّهِ - رضى الله عنهما - بِمِثْلِهِ عَنِ النَّبِيِّ صلى الله عليه وسلم
Translation
Muhammad b. 'Abbas b. Ja'far reported that he asked Jabir b. Abdullah (Allah be pleased with them), whether he had heard like this from the Messenger of Allah (ﷺ).