"Such of your women as have passed the age of monthly courses, for them the prescribed period, if ye have any doubts, is three months, and for those who have no courses (it is the same): for those who carry (life within their wombs), their period is until they deliver their burdens: and for those who fear Allah, He will make their path easy." - Quran 65:4 (read more)

"....The women asked, "O Allah's Apostle! What is deficient in our intelligence and religion?" He said, "Is not the evidence of two women equal to the witness of one man?" They replied in the affirmative. He said, "This is the deficiency in her intelligence. Isn't it true that a woman can neither pray nor fast during her menses?" The women replied in the affirmative. He said, "This is the deficiency in her religion." - Sahih Bukhari 1:6:301 (read more)

"Discipline. The husband has the right to discipline his wife if she disobeys him in something good, not if she disobeys him in something sinful, because Allaah has enjoined disciplining women by forsaking them in bed and by hitting them, when they do not obey. The Hanafis mentioned four situations in which a husband is permitted to discipline his wife by hitting her." - Sheikh Muhammed Salih Al-Munajjid