Leviticus 18:26-27

18:26 Ye shall therefore keep my statutes and my judgments, and shall not commit [any] of these abominations; [neither] any of your own nation, nor any stranger that sojourneth among you: 18:27 (For all these abominations have the men of the land done, which [were] before you, and the land is defiled;)

Leviticus 18:30

18:30 Therefore shall ye keep mine ordinance, that [ye] commit not [any one] of these abominable customs, which were committed before you, and that ye defile not yourselves therein: I [am] the LORD your God.