It was narrated from 'Aishah that the Prophet said: Seek the permission of women with regard to marriage. It was said: What if a virgin is too shy and remains silent? He said: That is her permission.
Abu Hurairah narrated that the Messenger of Allah said: A previously married woman should not be married until her consent has been sought, and a virgin should not be married until her permission has been sought. They said: O Messenger of Allah, what is her permission? He said: If she remains silent.