Sahih Muslim Book 8, Hadith Number 3308.

Chapter: Seeking consent of al-Thayyib in marriage in words and of a virgin in (meaningful) silence.

Sufyan reported on the basis of the same chain of transmitters (and the words are): A woman who has been previously married (Thayyib) has more right to her person than her guardian; and a virgin’s father must ask her consent from her, her consent being her silence, At times he said: Her silence is her affirmation.