Rabbi Lawrence Hoffman offers a very helpful reflection on Leviticus and its place in contemporary Judaism:
Moses’ opening instruction provides a broader picture: “When you offer a sacrifice from yourselves to God….” The peculiar placement of mikem (“from yourselves”) implies more than the rote offering of animals. Sacrifice can be anything, as long as you really own it, says Ibn Ezra; better still, it must be something “from within yourself.”
The point is this: we study the sacrifices not because we expect to offer up animals again, but because sacrifice is only tangentially about animals in the first place. On a deeper level, it is about the human passion to give up even what we hold dearest, if our doing so will further life’s larger purposes. It is about self-sacrifice or it is about nothing.