The Book of Marriage (Kitab Al-Nikah)
Muslim :: Book 8 : Hadith 3303
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (may peace be upon him) as having said: A woman without a husband (or divorced or a widow) must not be married until she is consulted, and a virgin must not be married until her permission is sought. They asked the Prophet of Allah (may peace be upon him): How her (virgin's) consent can be solicited? He (the Holy Prophet) said: That she keeps silence.