Wedlock, Marriage (Nikaah)

Bukhari :: Book 7 :: Volume 62 :: Hadith 67

Narrated Abu Huraira:

The Prophet said, "A matron should not be given in marriage except after consulting her; and a virgin should not be given in marriage except after her permission." The people asked, "O Allah's Apostle! How can we know her permission?" He said, "Her silence (indicates her permission)."