Leviticus 18:1-4

Unlawful Sexual Relations 1The LORD said to Moses, 2“Speak to the Israelites and say to them: ‘I am the LORD your God. 3You must not do as they do in Egypt, where you used to live, and you must not do as they do in the land of Canaan, where I am bringing you. Do not follow their practices. 4You must obey my laws and be careful to follow my decrees. I am the LORD your God.