The Lelover Rebbe and the wealthy Jew

Before Rabbi Dovid became known as the Lelover Rebbe, he was a talmid of Rabbi Elimelech and once received a ride to Lizhensk from a wealthy Jew. Since Rabbi Dovid appeared to be a poor beggar, the wealthy Jew made fun of Rabbi Dovid's appearance. Soon afterwards, the wealthy Jew realized that he had made a big mistake.