"Prohibited to you (For marriage) are:- Your mothers, daughters, sisters; father's sisters, Mother's sisters; brother's daughters, sister's daughters; foster-mothers (Who gave you suck), foster-sisters; your wives' mothers; your step-daughters under your guardianship, born of your wives to whom ye have gone in,- no prohibition if ye have not gone in;- (Those who have been) wives of your sons proceeding from your loins; and two sisters in wedlock at one and the same time, except for what is past; for Allah is Oft-forgiving, Most Merciful;" - Quran 4:23 (read more)

"Narrated 'Aisha: that the Prophet married her when she was six years old and he consummated his marriage when she was nine years old, and then she remained with him for nine years (i.e., till his death)." - Sahih Bukhari 7:62:64 (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