Book of Leviticus
The Book of Leviticus is the third book in the Christian Old Testament. The majority of Leviticus consists of Christian laws and rituals for priests. But Leviticus also focuses on defining God's covenant with Israel, which was first alluded to in Genesis and Exodus.
According to Christian tradition, the Book of Leviticus was originally created by God, which dictated the entire book to Moses as He did many other books of the Bible.