Leviticus 11:44-45 New International Version (NIV)
44 I am the Lord your God; consecrate yourselves and be holy, because I am holy. Do not make yourselves unclean by any creature that moves along the ground. 45 I am the Lord, who brought you up out of Egypt to be your God; therefore be holy, because I am holy.
God wants his people to be holy and set apart from the worldly ways. He does not want you to compromise or become corrupt. He wants you to lead a moral life. He designed laws and restrictions to keep us safe both socially and spiritually. We need to remain spiritually separate from the world’s wickedness. It is not an easy task to remain holy in an unholy world. God does not ask you to do this on your own. He will help you. Jesus is holy and blameless and as you stand before him because he provided a way, you are made clean. With Christ you can live in the world without having to be of the world.