Fasting 
Bukhari :: Book 3 :: Volume 31 :: Hadith 172
Narrated Abu Said:
The Prophet said, "Isn't it true that a woman does not pray and does not fast on menstruating? And that is the defect (a loss) in her religion."
Fasting
Bukhari :: Book 3 :: Volume 31 :: Hadith 172
Narrated Abu Said:
The Prophet said, "Isn't it true that a woman does not pray and does not fast on menstruating? And that is the defect (a loss) in her religion."