Sunan at-Tirmithiy كتاب النكاح باب ما جاء فى إكراه اليتيمة على التزويج
The Messenger of God, peace and blessings of God be upon him, said, "An orphan girl should be asked to voice her consent (in marriage). If she remains silent, that is (a sign of) approval, but if she refuses then she should not be married off [against her will]." Click on ḥadīth to read more