Leviticus 18-22 outlines the character God expects from his people. Their sexuality, worship, love for one another, obedience, treatment of their children, and priesthood should all reflect their position as the holy people of God. They have been set apart among the nations by God and their character is to reflect their new holy status.
The same is true for us. We are not only delivered from hell and headed toward heaven. Every aspect of our lives should reflect the holiness of our God. We are a holy people. A chosen nation. We are called to be perfect as our heavenly Father is perfect. We offer our bodies as living sacrifices, holy and pleasing to the Lord. As the Lord is holy, so we are to be holy in all that we do. Actually the Levitical character should be even more apparent in us, since the law of Christ has been written on our hearts.