Leviticus 18:26-28

Ye therefore shall keep my statutes and mine ordinances, and shall not do any of these abominations; neither the home-born, nor the stranger that sojourneth among you (for all these abominations have the men of the land done, that were before you, and the land is defiled); that the land vomit not you out also, when ye defile it, as it vomited out the nation that was before you.