Sahl b. Sa'd told of a woman who came to God’s Messenger and offered herself to him. When she had stood for a long time (i.e. without receiving an answer) a man got up and said, “Messenger of God, marry her to me if you have no need of her.” He asked him if he had anything to give her as dower, and when he replied that he had nothing but the lower garment he was wearing, he said, “Look for something, even though it should be an iron ring.” Then when the man had sought and found nothing God’s Messenger asked whether he knew any of the Qur'an, and when he replied that he knew surah so and so and surah so and so, he said, “I have given you her in marriage for the part of the Qur’an which you know.” In a version he said, “Go away, for I have given you her in marriage; and teach her some of the Qur'an." (Bukhari and Muslim.)