وَعَنْهُ أَيْضًا قَالَ: نَهَى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ عَنْ صِيَامِ يَوْمِ الْجُمُعَةِ إِلَّا أَنْ يَكُونَ فِي أَيَّامٍ
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) forbade fasting only on Friday, except if it is a habit of fasting on other days as well.