Fridays not allowed to fast

Bukhari :: Book 3 :: Volume 31 :: Hadith 205
Narrated Muhammad bin 'Abbas:
I asked Jabir "Did the Prophet forbid fasting on Fridays?" He replied, "Yes." (Other narrators added, "If he intends to fast only that day.")


Bukhari :: Book 3 :: Volume 31 :: Hadith 206
Narrated Abu Huraira:
I heard the Prophet saying, "None of you should fast on Friday unless he fasts a day before or after it."

Bukhari :: Book 3 :: Volume 31 :: Hadith 207
Narrated Abu Aiyub from Juwairiya bint Al-Harith:
The Prophet visited her (Juwairiya) on a Friday and she was fasting. He asked her, "Did you fast yesterday?" She said, "No." He said, "Do you intend to fast tomorrow?" She said, "No." He said, "Then break your fast." Through another series of narrators, Abu Aiyub is reported to have said, "He ordered her and she broke her fast."