Sahih Muslim Book 006, Hadith Number 2546.

Chapter : Disapproval of fasting on Friday alone.

Abu Huraira (Allah be pleased with him) reported Allah's Apostle (may peace be upon him) as saying: Do not single out the night (preceding) Friday among the nights for prayer and do not single out Friday among days for fasting but only when anyone among you is accustomed to fast (on dates) which coincide with this day (Friday).

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