Leviticus 18 - 20

God forbids all forms of incest and sexual immorality, which were commonly practice among the nations around them.

Chapter 19 details various laws regarding behavior between people, and contains the 2nd most important law in the Bible - “love your neighbor as yourself” (Leviticus 19:18)

Chapter 20 emphasizes God’s abhorrence of killing children as sacrifices to false gods, and details the punishments due to those who do such things, as well as various forms of sexual immorality. God say “be holy, for I am the Lord your God” (Leviticus 20:7)