The following is a brief summary of some of thoughts said over by R' Dovid Heber on the parsha this evening, as R' Frand did not give the final parsha shiur before Pesach as is his custom. Same rules as usual apply - I have attempted to reproduce these vorts to the best of my ability. Any perceived inconsistency is the result of my efforts to transcribe the shiur and should not be attributed to R' Heber.
In Parshas Tzav, the Torah introduces the sacrifice known as the Karban Todah. As we know from the laws of sacrifices which are recited in the morning, this sacrifice was permitted to be eaten for one day and one night and whatever was left over the following morning needed to be burned.
R' Heber asked - why are the laws of sacrifices different than most other Jewish law in which the days follows the night?
R' Heber answered by quoting R' Nissim Alpert who explained that in general a person sits "in the dark" when he begins an endeavor. He does not know whether he will be successful and he waits to see how it will turn out. Our days similarly begin at night as we wait for morning to be able to see. The Chofetz Chayim teaches that even our week has a night component as the week begins as chol and ends with Shabbos.
In contrast, Heavenly events do not have a night component - they begin with the day because they are clear and we see and are confident that they will be positive. Thus the karbanos all begin during the day.
The Medrash quotes a pasuk in Tehillim which states that a person who brings a Todah will honor Hashem. The word in the pasuk in Tehillim uses a multiple for honor and the Medrash teaches that the person who offers the sacrifice will bring honor after honor.
The Chasam Sofer explains that one form of Todah is brought by a person who was previously in danger. The person brings the Todah and blesses on being saved from the trouble. In so doing, he recognizes that all that Hashem does is for the good, including the danger from which the person was saved. He then blesses Hashem, both for bringing the danger and for saving him from it and allowing him to recognize Hashem.
R' Heber closed out the vort by quoting the Netziv who notes that the Todah had a lot of food, but was eaten in a short time since it was only one day and one night. The reason for the large volume of food and short period is so that the person bringing the sacrifice can invite others to partake of the food with him. The following day, any remnants will be Nosar and will need to be burned. Therefore the person invites others to join with him and see his appreciation for Hashem. This is another reason for the double language in the pasuk in Tehillim - when I bring others to join with me, I have simcha for me and with them.
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