"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)

"You should not initiate the greeting to a Jew or Christian. If a Muslim inadvertently greets a dhimmi, he does take it back. If a Jew or Christian greets a Muslim, he should answer, "On you ('alayk)." It is also said that one may answer with "And on you silam." "Silam" means a stone. That used to be said." - ibn Abi Zayd