The Zohar, Chapter “VaYikra (The Lord Called),” Item 129: …The offering of the poor is the lightest: two turtledoves or two young pigeons. And if not, he brings a little flour and is thus forgiven. At that time, it is declared and said, “For He has not despised nor abhorred the lowliness of the poor,” since the offering of the poor is the most praised.
This is talking about a person, with what degree of desire (Aviut) he can work in order to bestow. In the measure that his will to receive is revealed to him, he takes parts from it, the thicker and coarser ones, and if he is able to work with them in order to bestow, he is called rich. And if he can take only the smaller, weaker ones from his will to receive and bring them as a sacrifice, that is to bring them closer to the Creator, he is called poor.
The word “sacrifice” (Korban) derives from the word “bring closer” (Lekarev). According to what part of his will to receive a person brings closer to the Creator in order to use it to bestow, he is called rich or poor. The rich brings more, and the poor less; each one to the extent that he is able to work with his will to receive in order to bestow. “Sacrifice” is called the will to receive that I previously used in order to receive but now bring closer to the Creator, and in doing so transform it from a receiving to a bestowing one. Because of this new will to receive, I came closer to the Creator and made one step forward on the ladder to adhesion with the Creator.
From the 3rd part of the Daily Kabbalah Lesson 5/21/10, The Zohar