Leviticus is the center of the Torah and, since it describes how God is to be approached and worshiped, it is the most important of the books in the TANAK. In Leviticus 19 and 20 God defines how Israel is to behave as a holy people in the presence of a holy God. This behavior is to the benefit of the nation. They will be blessed if they follow God's instructions. More important, however, is that Israel's holiness is important to God's purposes. When they follow His laws, they become ambassadors of His goodness.