"...If the party liable is mentally deficient, or weak, or unable Himself to dictate, Let his guardian dictate faithfully, and get two witnesses, out of your own men, and if there are not two men, then a man and two women, such as ye choose, for witnesses, so that if one of them errs, the other can remind her. The witnesses should not refuse when they are called on (For evidence)." - Quran 2:282 (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)

"The Shaafa’is, the Hanbalis according to the well-known view of their madhhab, and others are of the view that circumcising women is obligatory. Many scholars are of the view that it is not obligatory in the case of women; rather it is Sunnah and is an honour for them. But we would like to point out here that it has medical benefits to which attention should be paid, regardless of the difference of opinion among the scholars as to whether it is obligatory or mustahabb." - Islam Q&A