When Moses tries to enter the temple he is unable to go into God's presence. How an impure and sinful people are going to be able to coexist with a pure and perfect God? This problem is what the book of Leviticus sets out to solve. In Leviticus, God gives His people the instructions they need to purify themselves so that it is safe for them to be so close to the all-powerful goodness, or holiness, of God. To us, these instructions can seem a little strange. All of them, however, have a purpose; to keep the Israelites in a state where they are able to commune with their God.