It was narrated that:
Sahl bin Sa'd said: “A woman came to the Prophet and he said: 'Who will marry her ?' A man said: 'I will.' The Prophet ﷺ said: 'Give her something, even if it is an iron ring.' He said: 'I do not have one.' He said: 'I marry her to you for what you know of the Quran.'”

حَدَّثَنَا حَفْصُ بْنُ عَمْرٍو، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، عَنْ سُفْيَانَ، عَنْ أَبِي حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ، قَالَ جَاءَتِ امْرَأَةٌ إِلَى النَّبِيِّ ـ ﷺ ـ قَالَ " مَنْ يَتَزَوَّجُهَا " . فَقَالَ رَجُلٌ أَنَا . فَقَالَ لَهُ النَّبِيُّ ـ ﷺ ـ " أَعْطِهَا وَلَوْ خَاتَمًا مِنْ حَدِيدٍ " . فَقَالَ لَيْسَ مَعِي . قَالَ " قَدْ زَوَّجْتُكَهَا عَلَى مَا مَعَكَ مِنَ الْقُرْآنِ " .