http://revach.net/article.php?id=2948

Section: Parshas HaShavua   Category: Story
Parshas Lech Licha: Rav Levi Yitzchok Of Berditchev Gets An Unwanted Bracha
Rav Levi Yitzchok Of Berditchev was collecting for a poor couple who were trying to raise funds to get married with at least the bare minimum.  He went to visit a very wealthy man to ask for money.  After telling the wealthy man all the sad details of their plight, the wealthy man gave the couple a hearty bracha wishing them a long healthy, happy, and prosperous life, but the money didn't seem to be very forthcoming.

Rav Levi Yitzchok thanked the man for the bracha, and added that we can learn from Malki Tzedek (Sheim ben Noach) the correct way to handle these matters.  When Avrohom came back from war with the four kings, the pasuk says (14:18-19) that Malki Tzedek came out with bread and wine.  Only after feeding him does the pasuk say, VaYivarcheihu.  "Brochos are nice after the money," explained Rav Levi Yitzchok, "not before!"  (Gilyon Peninim U'Parpara'os LaTorah)