Leviticus 18:28-30

28And if you defile the land, it will vomit you out as it vomited out the nations that were before you. 29“ ‘Everyone who does any of these detestable things—such persons must be cut off from their people. 30Keep my requirements and do not follow any of the detestable customs that were practiced before you came and do not defile yourselves with them. I am the LORD your God.’ ”