Mishkat al-Masabih #1960
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا تَخْتَصُّوا لَيْلَةَ الْجُمُعَةِ بِقِيَامٍ مِنْ بَيْنِ اللَّيَالِي وَلَا تَخْتَصُّوا يَوْمَ الْجُمُعَةِ بِصِيَامٍ مِنْ بَيْنِ الْأَيَّامِ إِلَّا أَنْ يَكُونَ فِي صَوْمٍ يَصُومهُ أحدكُم» . رَوَاهُ مُسلم
He reported God’s messenger as saying, “Do not choose Thursday night as a particular night for prayer, and do not choose Friday as a particular day for fasting, unless it occurs during a fast one of you is observing.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #1960 from Mishkat al-Masabih, in the Book of Fasting.