Sahih Bukhari Volume 008, Book 076, Hadith Number 454.
Narated By Sahl bin Sa'd As-Sa'id : A man passed by Allah's Apostle and the Prophet asked a man sitting beside him, "What is your opinion about this (passer-by)?" He replied, "This (passer-by) is from the noble class of people. By Allah, if he should ask for a lady's hand in marriage, he ought to be given her in marriage, and if he intercedes for somebody, his intercession will be accepted. Allah's Apostle kept quiet, and then another man passed by and Allah's Apostle asked the same man (his companion) again, "What is your opinion about this (second) one?" He said, "O Allah's Apostle! This person is one of the poor Muslims. If he should ask a lady's hand in marriage, no-one will accept him, and if he intercedes for somebody, no one will accept his intercession, and if he talks, no-one will listen to his talk." Then Allah's Apostle said, "This (poor man) is better than such a large number of the first type (i.e. rich men) as to fill the earth."