Abd Allāh while he was circumambulating the House: “Did the Messenger of Allah, peace and blessings be upon him, forbid fasting on Friday?” He replied, “Yes, by the Lord of this Kaaba (1).”
In the two Sahīh collections (2), Abū Hurayrah said: I heard the Prophet, peace and blessings be upon him, say: “None of you should fast on Friday unless he also fasts the day before or the day after (3).” This is al-Bukhārī’s wording.
In Sahīh Muslim (4), Abū Hurayrah narrated that the Prophet, peace and blessings be upon him, said: “Do not single out Friday night from among the nights for prayer, nor single out (5) Friday from among the days (6) for fasting, unless it coincides with a fast that one of you observes.”
In Sahīh al-Bukhārī (7), Juwayriyah bint al-Hārith narrated that the Prophet, peace and blessings be upon him, came to her on Friday while she was fasting. He asked, “Did you fast yesterday?” She replied, “No.” He asked, “Do you intend to fast tomorrow?” She replied, “No.” He said, “Then break your fast.”
In Imām Ahmad’s Musnad (8), Ibn Abbās narrated that the Prophet, peace and blessings be upon him, said: “Do not fast on Friday alone.”