Leviticus 27:32 "And concerning the tithe (one-tenth) of the herd, or of the flock...the tenth shall be holy to the L-rd"

"I plowed and planted and, now, I'll reap my harvest!" says the farmer.

"I designed and built and worked hard. Now, I'll earn my wages!" smiles the architect.

"I calculated and saved up, I invested my money and, now, I'll make my profit!" beams the broker.

"Wait a minute!" declares the Torah, "don't forget that it is HaShem who brings you success. You must show HaShem your appreciation!"

A Jew is commanded to set aside one tenth of his herds and flocks and offer them as sacrifices to HaShem who blesses his possessions.