The Prophet ﷺ 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 Messenger of Allah ﷺ! How can we know her permission?" He said, "Her silence (indicates her permission).  

أَنَّ النَّبِيَّ ﷺ قَالَ لاَ تُنْكَحُ الأَيِّمُ حَتَّى تُسْتَأْمَرَ وَلاَ تُنْكَحُ الْبِكْرُ حَتَّى تُسْتَأْذَنَ قَالُوا يَا رَسُولَ اللَّهِ وَكَيْفَ إِذْنُهَا قَالَ أَنْ تَسْكُتَ  

I asked the Prophet, "O Messenger of Allah ﷺ! Should the women be asked for their consent to their marriage?" He said, "Yes." I said, "A virgin, if asked, feels shy and keeps quiet." He said, "Her silence means her consent."  

قُلْتُ يَا رَسُولَ اللَّهِ يُسْتَأْمَرُ النِّسَاءُ فِي أَبْضَاعِهِنَّ قَالَ نَعَمْ قُلْتُ فَإِنَّ الْبِكْرَ تُسْتَأْمَرُ فَتَسْتَحِي فَتَسْكُتُ قَالَ سُكَاتُهَا إِذْنُهَا