The sacrifices are listed both in Parshat Vayikra, and again in Parshat Tzav - but in a different order. Why? When we closely examine the wording of the two parshiyot, It seems that Parashat Tzav presents a fundamentally different perspective on korbanot from that of Parashat Vayikra.  Vayikra offers the individual the opportunity to offer a sacrifice, while Parashat Tzav opens with the constant flame on the altar and the regular daily sacrifice, which express the altar's serving as a representation of the presence of the Shekhina. Therefore, the Torah teaches that the institution of sacrifices is more than just an opportunity offered to the people; it constitutes an essential part of the Mishkan, expressing the constant residence of the Shekhina among the Jewish people.

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion