As we get to what is often esteemed as the more tedious books of the Bible (i.e. Leviticus) it is imperative for us to remember who this God who is making these demands regarding how His people worship Him. Remember that Leviticus is a worship manual for God’s people. We confess that, “There is but one only, living, and true God, who is infinite in being and perfection, a most pure spirit, invisible, without body, parts, or passions; immutable, immense, eternal, incomprehensible, almighty, most wise, most holy, most free, most absolute; working all things according to the counsel of his own immutable and most righteous will, for his own glory (WCF Ch.II Sec.1).” This is the God whom we worship.
Now, since God is the Creator of the world, and since He has called us, His people, to worship Him, we should remember to worship Him according to His prescriptions and not according to our whims. Worship is not a flailing emotional catharsis for the worshipper. Rather, as Paul tells us, it is our reasonable service unto the God who has mercifully saved us (Rom. 12:1-2). Again, as the Westminster Confession puts it, “To him is due from angels and men, and every other creature, whatsoever worship, service, or obedience, He is pleased to require of them (WCF Ch.II Sec.2).”
So as you read Leviticus, along with Hebrews, remember that what is presented in shadowy form in the Levitical sacrifices and ceremonies are presented in Hebrews as the glorious midday sun. One Puritan described Leviticus as looking at someone you know and love dearly but with a veil over their face. Because you know Christ, you can discern His form and features through the veil of the Mosaic Law and Ordinances. Remember that the worship God demanded in Leviticus has not changed, but the sacrifice has changed. We still come to God through the mediatorial blood of another, but under the New Covenant, we come through the blood of the Lamb of God. We come through the blood of a sacrifice who rose back to life and ever pleads our cause before the Father. We worship God through Jesus Christ, and the power of the Holy Ghost.