Sahih al-Bukhari 5029

It is related that Sahl ibn Sa'd said, "A woman came to the Prophet, may Allah bless him and grant him peace, and stated, 'I have given myself to Allah and His Messenger, may Allah bless him and grant him peace.' He said, 'I am not in need of women.' A man said, 'Marry her to me.' He said, 'Give her a garment.' He said, 'I do not have the wherewithal.' The Prophet, may Allah bless him and grant him peace, said, 'Give her something, even if it is only an iron ring.' The man claimed that he had nothing. He said, 'What do you know of the Qur'an?' He replied, 'Such-and-such.' He said, 'I have married her to you for that amount of the Qur'an which you know.'"