Leviticus is a book of laws. Many of the laws were established especially for the priests. These laws defined their role in worship and in the community. Other laws in the book were for all of the Israelites. These laws defined proper attitudes and behaviors. The name Leviticus derives from the Greek word “Leuitikon,” which is the adjective form of “Levitical.” The word “Levitical” harkens back to when Jacob’s son, Levi, and all of his descendants were set apart by God as priests. This segregation applied more specifically to Levi’s descendant, Aaron, and Aaron’s descendants. Traditionally, Moses is considered the author of Leviticus.