"Men are overseers over women, by reason of that wherewith Allah hath made one of them excel over another, and by reason of that which they expend of their substance. Wherefore righteous women are obedient, and are watchers in husbands absence by the aid and protection of Allah. And those wives whose refractoriness ye fear, exhort them, and avoid them in beds, and beat them; but if they obey you, seek not a way against them; verily Allah is ever Lofty, Grand." - Quran 4:34 (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)

"If she is married without her permission, by threat or coercion, then the marriage is not valid. The only exeption is in the case of the father and his daughter who is less than nine years of age. There is no harm if he gets her married while she is less than nine years old, according to the correct opinion. This is based on the messenger of Allah (peace be upon him) marrying Aisha without her consent when she was less than nine years old, as is stated in authentic Hadith." - Shaikh ibn Baz